In which one among the following texts does the term kshetra-patni ('mistress of the field') originate?

The correct answer is Atharvaveda.

The term kshetra-patni ('mistress of the field' or 'queen of the soil') originates in the Atharvaveda. It is invoked alongside cosmic elements such as heaven, earth, and winds in rituals and incantations to ward off threats to the fields, ensure agricultural prosperity, and neutralize those who obstruct such incantations.

While the masculine counterpart Kshetrapati ('lord of the field') appears earlier in the Rigveda as a tutelary deity of agriculture and agrarian harmony, the feminine counterpart kshetra-patni is specifically attested in the Atharvaveda (e.g., AVŚ 2.12.1). This reflects the Atharvaveda's broader emphasis on practical magic, apotropaic rituals, and the protection of human endeavors against afflictions, sorcery, and disruption.