The correct answer is D. Using our arms to lift a small box
Explanation:
Skeletal muscles are those that are attached to the bones and are related to voluntary movement. An example of this is the multiple muscles that are attached to the femur in the legs and that are used during voluntary movements such as walking, jumping, among others. Besides this, skeletal muscles are different from cardiac muscles found in the heart and smooth muscles found in the organs as these two are related to involuntary movements.
According to this, the activity that is related to skeletal muscles is "Using our arms to lift a small box" because the muscles in the arms are attached to bones such as the scapula, the humerus and the radius which occurs in the case of skeletal muscles. Also, lifting a small box is a voluntary rather than automatic movement, and therefore the muscles involved in this are skeletal rather than soft or cardiac muscles.
