A normal, full-term pregnancy can range from
37-42 weeks. It's divided into three
trimesters. Each trimester lasts between 12
and 14 weeks, or about three months.
Specific changes occur to the fetus during
each of these trimesters.
Which of the following events occurs during
the 3rd Trimester?

A. Fingers and toes form.
B. The lungs fully develop.
C. A heartbeat can be heard with a stethoscope.
D. The cardiovascular system develops.