Can you test me on jamb style stoichiometry..then you will do corrections for me

Okay, let's test your knowledge of JAMB-style stoichiometry!

Here is your first question:

What mass of oxygen gas ($\text{O}_2$) is required to completely react with 4.0 g of methane ($\text{CH}_4$) according to the following balanced chemical equation?

$\text{CH}_4(\text{g}) + 2\text{O}_2(\text{g}) \rightarrow \text{CO}_2(\text{g}) + 2\text{H}_2\text{O}(\text{g})$

(Atomic masses: C = 12 g/mol, H = 1 g/mol, O = 16 g/mol)

A. 4.0 g
B. 8.0 g
C. 16.0 g
D. 32.0 g

Take your time and let me know your answer (A, B, C, or D)! I'll provide corrections afterwards.