A solution of acid A has a pH of 1 and a solution of acid B has a pH of 2. Which statement must be correct?

A.     Acid A is stronger than acid B.

B.     \({\text{[A]}} > {\text{[B]}}\).

C.     The concentration of \({{\text{H}}^ + }\) ions in A is higher than in B.

D.     The concentration of \({{\text{H}}^ + }\) ions in B is twice the concentration of \({{\text{H}}^ + }\) ions in A.

C