A. Pizza, which many people love, can also be nutritious. B.Thin-crust pizza with low-fat cheese has fewer calories. C.Who ordered deep-dish pizza D.Neapolitan pizza, my favorite, usually has a thin crust.
Adjective clauses usually start with words like who, which,where and why.I think the sentence you are looking for is A. Adjective clause being "which many people love".