Pregnancy

Step 1: Understanding the layers surrounding the ovum.
The ovum is surrounded by three primary layers:

Corona Radiata: The outermost layer composed of follicular cells, which provides nourishment and protection to the ovum.

Perivitelline Space: The fluid-filled space between the zona pellucida and the cell membrane of the ovum.

Zona Pellucida: A glycoprotein layer surrounding the plasma membrane of the ovum, essential for sperm binding and fertilization.

Step 2: Matching the labels.
From the image:

A: Represents the outermost layer, which is the corona radiate.

B: Represents the space between the zona pellucida and the ovum, the perivitelline space.

C: Represents the glycoprotein layer, the zona pellucida.

Step 3: Conclusion.
The correct labeling is: