What is the answer ? is mine right?

C. Obtain consistent data

Explanation:

When conducting an investigation, it doesn't matter whether the hypothesis was correct or not since you are trying to find that out. All you are trying to do is get data that may or may not be able to support that hypothesis that you made.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.