The shape of corolla may be 

A. Tubular

B. Funnel-shaped

C. Bell-shaped

detailed solution

Correct option is D

Shapes of corolla may beCampanulate : In this type of corolla, 5 gamopetalous petals are present. It's shape is similar to a bell. E.g., Tobacco, Raspberry, flowers of Campanula.Funnel shaped : In this, 5 gamopetalous petals are found. It's shape is similar to a funnel. E.g., Datura, Railway creeper.Tubular : In this, 5 gamopetalous petals are found which form tubular or cylindrical structure. E.g., Disc florets of sunflower which are situated in the centre.Rotate : In this, 5 gamopetalous petals are found and the fused part is formed above small tube and the petals are arranged in a whorl above the tube. E.g., Brinjal. Besides this, there are several other shapes of corolla is seen in various species.