The correct option is D corolla of Fabaceae family
C1+2+(2) represents the corolla of the Fabaceae family. To denote corolla, letter C is used in a floral formula.
1+2+(2) represents that there are a total of five petals. The large standard petal and two wing petals are free. The two keel petals are fused enclosing the reproductive parts. Fusion of petals is shown in brackets in the floral formula as (2).