C. Sensitivity
because this isn't a constant thing, so it isn't a. it isn't b. and it isn't d.
The defendant is the person or organization with which an action is being brought against. For example: a man rear-ends a woman in a car accident. The woman can file a lawsuit to recover (get) money from the man for her medical injuries and damage to her car. The woman is the plaintiff suing the man who is the defendant.
B Osteoporosis, it’s chronic and you’re born with it so it’s not preventable
These are all true but I do not know the last part of the answer
I’m pretty sure it’s a muscle contraction