The study of flower is known as

The correct answer is A. Anthology.

Anthology is the study of flowers. It is a branch of botany that deals with the classification, identification, and description of flowers. Anthologists also study the structure and function of flowers, as well as their role in plant reproduction.

The other options are incorrect.

• Physiology is the study of the function of living things.
• Agrostology is the study of grasses.
• Phycology is the study of algae.