Correct answer: B. Grihapati
Explanation: The correct answer is Grihapati, meaning the lord or head of the household. In Rigvedic society, the family was an important basic social unit, and the senior male authority generally supervised domestic, economic, and ritual activities. Gramani was associated with the leadership of a village or settlement, not specifically with an individual family. Mahamatra is a later administrative designation, especially associated with Mauryan governance, while Senapati means military commander. Therefore, the term that directly identifies the head of a Rigvedic household is Grihapati. Remembering the difference between household, village, and military offices prevents confusion in this question.