The correct option is A 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 patel) is a single petal with two lobes. It is also called as a standard petal. Two more petals form the wings (lateral petals). The remaining two anterior petals are usually fused together and encloses the essential organs.
Thus, the correct answer is option A.