Final answer:
Only option A, -P/Q, is equivalent to P/-Q. The other options represent different numerical relationships and are not equivalent to the expression P/-Q.
Step-by-step explanation:
The expressions equivalent to P/-Q can be found by simplifying the given fraction. Expression A. -P/Q is equivalent because multiplying the numerator and the denominator of P/-Q by -1 will result in -P/Q. The other options B. P/Q, C. -PQ, and D. PQ, do not share this equivalence because they represent different operations and relationships between P and Q.