The probability that A speaks truth is $\frac{4}{5}$, while this probability for B is $\frac{3}{4}$. The probability that they contradict each other when asked to speak on a fact is

Question

( A ) $\frac{3}{20}$
( B ) $\frac{4}{5}$
( C ) $\frac{1}{5}$
( D ) $\frac{7}{20}$