The correct option is B Flowers actinomorphic, twisted aestivation and gamopetalous
Twisted aestivation is found in Malvaceae family. The characteristics of this family include, hypogynous, pentamerous flowers, presence of epicalyx, twisted aestivation of petals, basal part of the petals united with the basal part of the staminal tube, stamens are monadelphous and axile placentation.
Therefore, the correct answer is option B.