B
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
A cow and a frog have similar bone structures in their forelimbs. Both have phalanges, radius, ulna, and humerus bones. However, the cow and frog are animals with very different life cycles from each other. Which most likely describes why the body structures of these animals are so similar?

### Choices:
A. Both have undergone similar mutations.
B. Both descended from a common ancestor.
C. Both reacted similarly to environmental pressures.
D. Both spread out from the same geographical region.

### Answer:
