For a reaction aA + bB ⇌ cC + dD, write the expression for Kc.

• A. Kc = [C]^c [D]^d / ([A]^a [B]^b)
• B. Kc = [A]^a [B]^b / ([C]^c [D]^d)
• C. Kc = ([C][D])/([A][B])
• D. Kc = [A]^a [B]^b [C]^c [D]^d

Answer: (A)