Which among the following is not correct about flower?

• A. A flower has 4 whorls arranged successively i.e. calyx, corolla, androecium and gynoecium
• B. Members of calyx and corolla are called as sepals and petals respectively
• C. In polysepalous, the sepals are arranged in a free manner whereas in gamosepalous, the sepals are united
• D. Tulip is an example of polypetalous