Which is the only human cell that has a flagella?

The correct answer is B. Sperm.

Blood cells are red blood cells (erythrocytes) and white blood cells (leukocytes). Red blood cells do not have flagella, and white blood cells have a variety of shapes and structures, but none of them have flagella.

Neurons are the basic units of the nervous system. They do not have flagella.

Liver cells are the basic units of the liver. They do not have flagella.

Sperm are the male gametes. They have a long, whip-like tail called a flagellum that helps them swim towards the egg.