A baby who first habituates to a green circle and then recovers to a blue circle

The correct answer is: can distinguish between green and blue.

Firstly, habituation refers to when an individual shows a decreased response to a stimulus after repeated exposure to it. In this instance, when a baby habituates to green circle, it means that he no longer pays much attention to it or responds to it. On the other hand, when the baby is presented with a blue circle, he displayed recovery - i. e. reacted to the new stimulus.