Consider the phase diagram, which applies?

State A is solid, B is vapor, and C is liquid.

(A) False
A (solid) → C (liquid) is melting (fusion).

(B) False
A (solid) → B (vapor) → C (liquid)

(C) False
If the compound is in state A (solid), continued reduction of pressure (at constant temperature) will cause it to sublime (becomes B (vapor)).

The answer: (D) None of these statement is correct.