Which of the following statement is true ?

Question

( A ) $HNO_3$ is a stronger acid than $HNO_2$
( B ) In aqueous medium $HF$ is a stronger acid than $HCl$
( C ) $HClO_4$ is a weaker acid than $HClO_3$
( D ) $H_3PO_3$ is a stronger acid than $H_2SO_3$