Pl Help me 2. In the text box below, explain why abstinence is the safest way for teenagers to avoid STDs and unplanned pregnancies.

People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.

Ithink the answer is b hope this