The correct answer is [C] To specify (as an essential condition of an agreement); to state a demand or requirement; to insist upon or lay down (as an essential part of the terms of an agreement). To require as an essential condition; to make an express demand.

Stipulate comes from Latin stipulari (to bargain).

Examples of use:

• He stipulated that the language program would consist of twenty lessons.
• The first Saturday in May was stipulated to be the commencement day.