The correct option is B Malvaceae
Pentamerous flowers having monoadelphous stamen and dry dehiscent fruit are persent in Malvaceae. The flowers are commonly borne in definite or indefinite axillary inflorescences, which are often reduced to a single flower, but may also be cauliflorous, oppositifolious or terminal. They often bear supernumerary bracts. They can be unisexual or bisexual and are generally actinomorphic, often associated with conspicuous bracts, forming an epicalyx. They generally have five valvate sepals, most frequently basally connate, with five imbricate petals. The fruits are most often loculicidal capsules, schizocarps or nuts.
Therefore, the correct answer is option B.