The pH of a 0.1 molar solution of the acid HQ is 3. The value of the ionization constant, Ka of this acid is :

Question

( A ) $1 \times 10^{-7}$
( B ) $1 \times 10^{-3}$
( C ) $1 \times 10^{-5}$
( D ) $3 \times 10^{-1}$