Environments for infants need to provide many opportunities for
a. sensory exploration.
b. watching other babies.
c. playing with each other.
d. climbing.

The answer is letter A. 

Babies should be provided with an environment that is suited for sensory exploration. As babies begin their stages of development they begin to learn things through different sensory systems. This is the reason why they hold things up and down or play with objects that are given to them. Babies are generally sponges that absorb available stimuli in their environment. In able to develop the different sensory systems parents should give their children the opportunity to explore the area by touch, sight, smell, taste, and hearing. 

Try tylenol or see a professional