The answer is D, a catalyst speeds up the reaction rate so a catalyzed reaction will have higher activation energy thus and increase in rate of reaction.
Skin cell serves a completely different purpose. Muscle cells have large amount of mitochondria in them and are energy rich to perform functions that require movement. They are more durable than epithelial cells. Epithelial cells (skin cells) are quickly shed, quickly replaced, lack mitochondria and are mass produced by the body.
The answer is attached in the photo