which of the following are the functions of the integumentary system?
blood cell production in soft marrow tissues and mineral reserves
largest organ of the body for protection and body temperature regulation
vitamin d production and pumping blood through vessels
voluntary movement and contractile movement

Blood cell production in soft marrow tissues and mineral reserves occurs in the bones. This means that this is the skeletal system.

Largest organ of the body for protection and body temperature regulation is done by they skin. Skin protects internal organs from bactiria or pathogens from getting inside the body. The skin also sweats to keep the body at a constent temperatrue. Skin is part of the integumentary system

Vitamin D production and pumping blood through vessels occurs in the heart/veins which are part of the cardiovascular system.

Voluntary movement and contractile movement is done by our muscles, making this par of the muscular system.

The only possible answer is:  Largest organ of the body for protection and body temperature regulation

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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.