1. Infants really enjoy peek-a-boo -- the game where parents hide their face with their hand and then suddenly remove their hands from their face and say, "peek-a-boo!"
For Piaget, this would be a good example of how infants lack:
a. reversibility
O b. theory of mind
O c. object permanence
O d. centration
e conservation

C

Explanation:

The statemtent: "Gregorian chants developed because Pope Gregory I wanted to standardize masses" is true.

Gregorian chant is made up of a single-line melody. It is monophonic in nature with no harmony. It has a flowing vocal line with Latin influence.

Gregorian chant constitues the central tradition of Western plainchant, a form of monophonic, unaccompanied sacred song of the Roman Catholic Church.