Answer:a. Non-random survival and reproduction favors finches with broader beaks, increasing the bill size in the next generation.
Step-by-step explanation:
Each species will develop or evolve a trait that will allow them to survive better and better as time goes by .
Theiry trait keep improving so that they can compete better and efficiently.
These beaks may be the adaption that is needed in order to obtain food efficiently and effectively.
It will improve their survival as they evolve and develop this improved beaks.