Which of the following, on its own, would be support for a critical period of development?
A) When earmuffs are placed on a dog's ears to block out sound between 1 and 4 weeks old, they later have impaired hearing abilities compared to normal dogs of the same age.
B) When nose plugs are placed on the noses of monkeys between 2 and 4 months old, they can distinguish the smells of a ripe and unripe banana as well as a normal monkey can.
C) When eye patches are placed on the eyes of dogs between the ages of 1 and 6 weeks old, puppies initially have impaired vision but the impairment is reversed once the eye patches are removed.
D) When a Kitten is visually deprived after the first 6 weeks of life, it experiences no visual impairments upon the cessation of deprivation and has vision comparable to kittens of a similar age.
Answer: A