The critical period for development, when exposure to disease prenatally can have

during the first 3 months.

It's 3 months

Explanation:

Although people tend to feel well at this stage (3months) it is important to remember that the virus/bacteria is still active. As it continues to reproduce and infect new cells also damages a person's immune system at this period of time.

1.

B

2.

B

3.

A Chinese immigrant chooses to move to France over the United States.