AHSME 1970 Problem 17

If $r>0$, then for all $p$ and $q$ such that $pq\ne 0$ and $pr>qr$, we have $\text{(A) } -p>-q \text{(B) } -p>q \text{(C) } 1>-q/p \text{(D) } 1<q/p \text{(E) None of these}$