Exp) Option b is the correct answer.

The Rigveda contains several references to early agricultural practices, fertility, cultivation, and prayers associated with productive land. Although early Vedic society retained strong pastoral features, agriculture had already acquired growing importance. Deities connected with cultivated fields and agricultural prosperity appear in Rigvedic hymns.  The term Kshetrapati (“lord/protector of the field”) is explicitly mentioned in the Rigveda in connection with agricultural land and fertility. The text contains hymns invoking agricultural prosperity, rains, crops, and protection of fields.

The feminine expression kshetra-patni (“mistress of the field”) is associated with the Atharva Veda.

Source: https://egyankosh.ac.in/bitstream/123456789/115655/3/Unit-3.pdf – History of Bharat From The Earliest Times to 700 CE -ECONOMIC LIFE OF THE VEDIC PERIOD-  Page 73