Tourist Companies Start Visiting Island X,where a Population of Medium

Tourist companies start visiting Island X,where a population of medium ground finches (see question 20) feeds on the tough-fruited Tribulus cistoides.The tourist companies set up reliable feeding stations with a variety of bird seeds (different types and sizes) ,so that tourists can get a better look at the finches.Which of these events is now most likely to occur to finch beaks on Island X?

A) evolution of yet larger,deeper beaks over time,until all birds have relatively large,deep beaks
B) evolution of smaller,pointier beaks over time,until all birds have relatively small,pointy beaks
C) increased variation in beak size and shape over time
D) no change in beak size and shape over time

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