Sunflower

The flowers are Zygomorphic in 

$(a)$ Mustard   $(b)$ Gulmohar    $(c)$ Cassia    $(d)$ Datura      $(e)$ Chilly

Choose the correct answer from the options given below:

Main axis continues to grow, the flowers are borne laterally in acropetal succession. This is a characteristic of which type of inflorescence?

Identify flower parts $A$ to $D$ in the given diagrams correctly

Reproductive whorl of flower.