B) Involuntary muscles
Smooth muscles are from the family of Involuntary muscles. Involuntary muscles are those that are not under conscious control, meaning they cannot be directly controlled by the individual's will. Smooth muscles are found in the walls of internal organs, blood vessels, and other structures, and are responsible for involuntary movements such as the contractions of the digestive tract, blood vessel dilation and constriction, and many other essential bodily functions.