Answer: b) actin filaments
Step-by-step explanation:
The contractile ring in animal cells is formed by actin filaments. This is a structure made up of actin proteins that are arranged in a circular pattern, forming a contractile ring which is responsible for pulling the cell apart in the process of cell division. During cell division, the contractile ring contracts, creating a constricting force that narrows the cell into two daughter cells. This mechanism is essential for maintaining cellular integrity and is essential for many bodily functions, such as muscle contraction, blood vessel formation, inflammation, and even the development of embryos and fetus.