The correct option is A Lomentum
The fruit of a groundnut is a lomentum. In botanical terms, nut specifically refers to indehiscent fruit, the peanut is not technically a nut, but rather a legume and its fruit is a lomentum. Lomentum is a dry fruit of certain leguminous plants, having constrictions between the seeds and separating at maturity into one-seeded segments. A loment (or lomentum) is a type of indehiscent legume fruit that breaks apart at constrictions occurring between segments, so that each segment contains one seed. It is a type of schizocarp.
Thus, the correct answer is option A.