Antonym of MASK

Answer: Option C

Mask : disguise.
Deface : spoil the surface or appearance of (something), for example by drawing or writing on it.
Injure : do physical harm or damage to (someone).
Expose : make (something) visible by uncovering it.
Hit : bring one's hand or a tool or weapon into contact with (someone or something) quickly and forcefully.

Antonym of Mask is Expose