Astatic stretch is
safe, because it requires a partner or machine for assistance
safe, because it stretches the muscle and joint without causing pain
unsafe, because it involves holding a position for 15-30 seconds
unsafe, because it uses the body's momentum to stretch the muscle

it's false.

"every person has their limitations which prevent us from accomplishing something. some are better than mathematics for example and some are worse. those people who are worse might never be able to become mathematicians, but that does not mean that they would not be great at doing something else."

i think the answer is d.