What is the volume of the stone?

The diagram illustrates the water displacement method (using a Eureka can) to find the volume of an irregular object. The volume of the displaced water is equal to the volume of the stone.

From diagram B, the measuring cylinder shows that the volume of the displaced water is $10 \text{ cm}^3$.

Since the volume of the displaced water is equal to the volume of the stone, the volume of the stone is $10 \text{ cm}^3$.

This matches option B.

The volume of the stone is $\boxed{\text{B } 10 \text{ cm}^3}$.