Based on the information provided about medium ground finches during a drought, the correct statement is:
The larger beak sizes after the drought allowed finches that could consume hard seeds survive compared to finches with smaller beaks who could only eat soft seeds were put at more risk of extinction.
This is generally true because during periods of drought, food availability can change, and larger beaks would be advantageous for accessing harder seeds that remain available when softer seeds are scarce.