What is a Metamorphic Rock? rock that forms when existing rock changes to a new rock because of heat and pressure
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rock that forms by the process of compaction and cementation of sediments
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rock that forms when melted rock (magma, lava) cools and hardens
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A) rock that forms when existing rock changes to a new rock because of heat and pressure ..hope this helped!

Explanation:

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.