The correct answer is (C) To disguise; to cloak or conceal (identity, character, thoughts, feeling, motive, intention, act) to give a false impression; to feign; to conceal the real nature of. To put on the appearance of.

Dissemble comes from Old French dissimuler, Latin dis + simulare (to pretend).

Examples of use:

• It seemed important to dissemble his incompetence.
• They dissembled their feelings of anger.