The correct option is B diadelphous stamen, marginal placenta and large posterior petal
Fabaceae family is the pea family plant. Some of the characteristics of fabaceae are - diadelphous stamen; marignal placenta; five petals consisting of a posterior standard petal, two lateral wings, two anterior ones forming a keel (vexillary aestivation); bisexual and zygomorphic flower; racemose inflorescence; ovary superior; legume fruit; non-endospermic seeds.