Ascientific theory a. is the same as pseudoscience b. attempts to explain observations of the natural world c. will become a scientific law in time d. becomes a scientific law when its discoverer dies

I think its B. Attempts to explain observations of the natural world

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.