Enzymes are always consumed by catalyzing a reaction increase the rate at which a reaction occurs sometimes increase the amount of energy necessary to initiate a reaction catalyze reactions that release energy, but not those that consume energy

The correct answer is that it increases the rate at which a reaction occurs.  

Enzymes refer to the molecules of protein in cells that function as catalysts. The enzymes accelerate the chemical reactions in the body, however, do not get completely used up in the procedure. The majority of the biochemical reactions in the living species require enzymes. With the presence of an enzyme, the chemical reactions go up much quicker than they would in the absence of an enzyme.  

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1 is the answer to this problem