Biology

The correct answer is: B.It helped him develop the theory of natural selection.

Explanation:

Darwin's observations of finches on the Galápagos Islands were crucial in shaping his theory of natural selection. He noticed that different species of finches had variations in their beaks, which were adapted to the specific types of food available on their respective islands. This led him to the idea that species evolve over time through the process of natural selection, where individuals with traits better suited to their environment are more likely to survive and reproduce, passing on those advantageous traits.