The answer is letter A.
Stress
often causes the muscles to contract and tighten. This happens because
relatively high amounts of hormones that are stress-related are released in the
blood. This then causes the muscles to contract and tighten causing cramps and
uncomfortable feelings in an individual. Stress-related stimulus that occurs
mostly within the brain, triggers
a response in the muscle contractions causing it to excessively contract and
tighten. An individual is
suggested to perform deep breathing exercises and stretches to reduce the
tightness in the muscles and to calm the nerves to return to its normal state.
