The name Papilionaceae and Cruciferae is based on

Family Cruciferae is characterized by presence of petals 4 in its corolla which are arranged in single whorl in valvate aestivation. The four narrow petals open at right angle to each other which in turn gives an appearance of Greek cross; hence, the name cruciform corolla.
Papilionaceae is another name of family fabaceae. It includes the leguminous plants whose flowers have butterfly-shaped corollas with single large posterior petal termed as vexillum, two lateral petals and one anterior keel; Papilio is Latin word for butterfly, hence the name Papilionaceae. Androecium is stamens in the flower which forms a whorl surrounding the gynoecium and is inside the perianth. Gynoecium is the innermost whorl of (one or more) pistils in a flower which represents female reproductive part. Fruit is a ripened ovary which serves to protect the ripening ovule. 
Therefore, the correct answer is option A.