The floral formula is that of :
Sunhemp belongs to the family of Fabaceae. It shows the actinomorphic flower with 5 sepals, 5 petals in 1+2+ (2) form.
Tulip belongs to the family of Liliaceae. It shows the actinomorphic flower with 3 + 3 petals, 3+3 stamens with 3 carpels.
Soybean belongs to the family of Fabaceae. It shows with 5 sepals, 5 petals in 1+2+ (2).
Tobacco belongs to family Solanaceae, which shows an actinomorphic flower with 5 sepals, 5 petals, 5 stamens. These are united with petals of epipetalous and 2 carpels.
Thus, the correct option is A.