What are the names of below these question digest? a) fatsb) carbohydratesc) proteins

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.