Inflorescence of which one of the following sets completely develop into composite fruits?

Spike is the inflorescence in which the flowers come directly from the stem, e.g. Amaranthus species. It is a type of racemose inflorescence. Catkin is the modified form of spike inflorescence with a long and drooping axis bearing unisexual flowers, e.g, oak. Hypanthodium is the inflorescence in which the receptacle forms a cavity and the flowers are formed on the surface of the receptacle. These all inflorescences completely develop into composite fruits. So, the correct option is B.