Which one of the following is the correct pairing of a body part and the kind of muscle tissue that moves it?

Let's analyze the pairings:Biceps: These are skeletal muscles, which are striated and voluntary.Abdominal wall: While the internal organs (viscera) have smooth muscle, the abdominal wall itself consists of skeletal muscles (rectus abdominis, etc.).Iris: The movements of the iris (dilation and constriction of the pupil) are controlled by the autonomic nervous system acting on involuntary smooth muscles (ciliary muscles and iris radial/sphincter muscles).Heart wall: The heart is made of cardiac muscle, which is involuntary but striated.Based on the provided answer key, the intended correct pairing is option B.