Smooth muscle is sometimes called visceral muscle because it:
a. is voluntary
b. isn't involved in movement
c. is found in organs
d. lacks striations

The answer is letter C. Smooth muscles are also called visceral muscles because they are mostly found surrounding the different organs of the body. These muscles serve as cushion or protections for organs that are mostly found within the abdominal cavity. Unlike skeletal muscles, this muscles move involuntarily, or on their own. They are composed of bundles of specialized cells capable of contracting and relaxing to create movements, like the process of the small and large intestines during digestion, and the function of the rectum during excretion. 

Exposure to solar flares would be the correct answer