Which Statement Concerning Chemical Reactions and Catalysts Is True

Multiple Choice

Which statement concerning chemical reactions and catalysts is true?

A) In living systems, most chemical conversions do not involve catalysts.
B) Spontaneous chemical changes occur rapidly in aqueous solutions.
C) Water functions as a catalyst in many biochemical conversions.
D) Lightning was a catalyst for polymerization of large molecules on early Earth.
E) Catalysts are necessary for life because they speed up biochemical reactions that would otherwise take too long to occur.