The correct option is A Arachis hypogaea
Cleistogamous flowers are flowers which always remain closed. Pollination occurring in closed flowers is cleistogamy. It is a condition in which flower does not open. It is an adaptation seen in plants to ensure self-pollination. In such flowers, the anthers and stigma lie close to each other. When anther dehisces in the flower buds, pollen grains come in contact with stigma to effect pollination. It ensures seed formation even in the absences of any pollination agent. Cleistogamous flowers are found in Arachis hypogaea.