D is the answer because physical ya something you do and social is like talking
<span>A disease is a disorder of structure or function in an organism; diseases are especially characterized by different symptoms. Diseases may be caused by a variety of mechanisms including invasion of a foreign organism or substant to genetically inherited diseases.</span>
<span>Class B would be the answer
I hope this helped you :) </span>
The muscle cells cause the involuntary reaction
