Which Statement by a Nursing Student About the Mechanism of Action

Which statement by a nursing student about the mechanism of action of sulfonamides indicates the need for further instruction?

A) Sulfonamides resemble the precursor molecule,PABA,so the enzymes needed for the synthesis of folic acid bind with sulfonamide instead of with PABA,stopping bacterial growth."
B) Sulfonamides slow the growth of bacteria because they only inhibit folic acid that is synthesized by bacteria."
C) Sulfonamides are effective against uropathogens by inhibiting the synthesis of bacterial folic acid."
D) Sulfonamides are most effective in clients who eat large amounts of foods rich in folic acid."