The correct answer is (B) To command; to order (someone) or urge strongly to do something. 2. to prescribe or impose on someone (action, conduct). Finally, to prohibit, forbid, or restrain.

Enjoin comes from Middle English enjoignen, Old French enjoindre, Latin injungere

Examples of use:

• The police enjoined all inhabitants to remain inside.
• She was enjoined to follow a strict diet.