In given questions is based on a set of given propositions I to IV. Select the best answer to each of these questions:
I : All P are Q
II : Some P are not Q
III : Some, but not all, P are Q
IV : No P is Q.
Considered only by themselves, all of the following pairs of statements might both be false but could not both be true except

Options

A. I, II and III could all be false.
B. I, II and III could all be true.
C. II, III and IV could all be false.
D. II , III and IV could all be true.

Answer

A