Choose the incorrect statement w.r.t. corolla.

• A

  Corolla is composed of petals.

• B

  Corolla may be tubular, bell-shaped, funnel-shaped or wheel-shaped.

• C

  Polypetalous condition is observed in all members of Brassicaceae family.

• D

  Petals are usually green in colour at early stages and protect the flower in the bud condition.