Key concept: At a given temperature, a liquid with higher vapour pressure is more volatile and therefore has weaker intermolecular forces.

Also, the liquid which reaches a given vapour pressure at a lower temperature has weaker intermolecular interactions.

From the vapour pressure vs temperature graph:

• Curve X lies above Y at the same temperature, so $P_X > P_Y$.
• Therefore, X has weaker intermolecular forces than Y.
• Hence inference (B) is correct and (A) is false.

Comparing Z and Y:

• Curve Z lies below Y at the same temperature, so $P_Z < P_Y$.
• Therefore, Z has stronger intermolecular forces than Y, not lower.
• Hence inference (C) is false.

Therefore, the only correct inference is: $\boxed{(B)}$

Matching with options:

• Option A: $(B)$
• So the correct option is A.