P, Q, R, S are four statements. Relation between these statements is as follows.
If P is true then Q must be true.
If Q is true then R must be true.
If S is true then either Q is false or R is false.
Then which of the following must be true.

Options

A. If P is true then S is false
B. If S is false then Q must be true
C. If Q is true then P must be true
D. If R is true then Q must be true

Answer

A