Male peacocks have tail feathers that make up about 60% of their body length. During the mating season they contract muscles to shake these feathers in front of females; females evaluate the feather rustling as part of selecting their mate. The _____ is the mechanistic cause of this behavior; the _____ is the adaptive function of this behavior.
A)mate choice; ability to shake the tail
B)ability to shake the tail; mate choice
C)female evaluation of the behavior; ability to shake the tail
D)ability to shake the tail; female evaluation of the behavior