B. their beaks were adaptions related to the foods the finches ate
Darwin concluded that the finches descended from a common ancestor, yet with time, the finches' beaks adapted to make food easier to access.
Phanerozoic Eon. Hope this helps
The best way to answer this is by using a Punnet Square which I have provided below. Remember that capital letters always represent dominant traits, so there is a 50% of their child having free earlobes and 50% of it having attached earlobes