7465. The scheme failed for want of adequate funds.

✅ The correct answer is option D.
Necessary : needed to be done, achieved, or present; essential.

Recommended : advised or suggested as good or suitable.

Required : officially compulsory, or otherwise considered essential; indispensable.

Sufficient : enough; adequate.

Adequate : satisfactory or acceptable in quality or quantity.

Synonym of Adequate is Sufficient