Develop(s) more rapidly during early childhood, and develop(s) more rapidly during middle and late childhood.

The answer in the first space provided is short term memory as this develops more rapidly during early child hood as the brain of an individual during this stage isn't mature yet and not fully developed, that is why it is likely that the child will experience short term memory. In the second space provided, the answer is long term memory because during the stage of middle and late child hood, this is where the mind of the person has acquired of having to mature and where it usually fully develops, that is why people in this stage would likely remember things and have a long term memory for storage than of during the early childhood.

a would be the answer

answer; no longer than a reasonable period of time;