The correct answer is (A) To be passive; to live in an inactive, passive, or unthinking manner. To lead an inactive life with little intellectual stimulus or physical exertion. To lead a life of monotony. To live like a plant, fulfilling vegetable functions; and little more.

Vegetate comes from Latin vegetare (to quicken, enliven)

Examples of use:

• The older citizens in some nursing homes were simply left to vegetate.
• It is better to get up and participate than to lie on that couch and vegetate.