Use the example below to answer questions 26 - 29:

Given: $T = 42$, $BM = 5$, $BR = 7$. Find $BL$.
Using the rule $T = BL \times BR$:

$$BL \times 7 = 42$$ $$BL = \frac{42}{7}$$ $$BL = 6$$

Let's verify with the $BM$ rule: $BM = BR - 2 \implies 5 = 7 - 2$. This is consistent.
Also, $BM = BL - 1 \implies 5 = 6 - 1$. This is also consistent.
The missing number is 6.
The correct option is B.

$$\boxed{\text{B. } 6}$$

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Given: $T = 12$, $BL = 3$, $BM = 2$. Find $BR$.
Using the rule $T = BL \times BR$:

$$3 \times BR = 12$$ $$BR = \frac{12}{3}$$ $$BR = 4$$

Let's verify with the $BM$ rule: $BM = BR - 2 \implies 2 = 4 - 2$. This is consistent.
Also, $BM = BL - 1 \implies 2 = 3 - 1$. This is also consistent.
The missing number is 4.
The correct option is C.

$$\boxed{\text{C. } 4}$$

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Given: $BM = 0$, $BR = 2$. Find $T$.
First, find $BL$ using the $BM$ rule: $BM = BR - 2$:

$$0 = 2 - 2$$

This is consistent.
Now, find $BL$ using $BM = BL - 1$:

$$0 = BL - 1$$ $$BL = 1$$

Now, use the rule $T = BL \times BR$:

$$T = 1 \times 2$$ $$T = 2$$

The missing number is 2.
The correct option is C.

$$\boxed{\text{C. } 2}$$

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Given: $T = 72$, $BL = 8$, $BR = 9$. Find $BM$.
First, verify the $T$ rule: $T = BL \times BR \implies 72 = 8 \times 9$. This is consistent.
Now, find $BM$ using the rule $BM = BR - 2$:

$$BM = 9 - 2$$ $$BM = 7$$

Alternatively, find $BM$ using the rule $BM = BL - 1$:

$$BM = 8 - 1$$ $$BM = 7$$

Both patterns consistently lead to $BM = 7$.
However, the provided options for question 29 are A. 1, B. 4, C. 6, D. 8, E. 9. The calculated answer 7 is not among the options. This indicates a potential error in the question or the provided options. Since I must choose from the given options, and 7 is not available, I cannot provide a definitive answer from the choices based on the established pattern.

Given the constraint to select an option, and the clear pattern leading to 7, there might be a misinterpretation or a flaw in the question's options. If forced to choose, and assuming there's a slight deviation or a different, less obvious pattern, it's impossible to determine without further information. However, based on the consistent pattern derived from the examples, the answer is 7. Since 7 is not an option, I cannot select a correct option.

Let's assume there's a typo in the question and the question mark was meant to be at the top, then the answer would be $8 \times 9 = 72$. But it's clearly at the middle bottom.
If the question intended for the middle number to be a distractor, then its value cannot be determined. But the question asks for it.

Given the strict instructions to select an option, and the derived answer 7 not being present, I will state that the derived answer is 7 and that it is not among the options.

The missing number is 7. As 7 is not among the given options (A. 1, B. 4, C. 6, D. 8, E. 9), there might be an error in the question or the options provided.