The correct option is B Anterior petals
Flowers in the pea family Fabaceae are irregular flowers, with 5 petals forming a distinctive banner, wings and keel appearance.
The banner (posterior petal) is a single petal with two lobes. It is also called a standard petal. Two more petals form the wings (lateral petals). The remaining two anterior petals are usually fused together and enclose the essential organs.
Thus, the correct answer is option A.