The correct option is B
5 cm length and 2.5 cm diameter
Size of testis measures 3.5-5 cm in length by 2.5-3 cm in both width by 3 cm in depth (anteroposterior diameter). The average size of a man testicle is about 4 x 3 x 2 centimeters (cm) in size and is oval shaped.
Men have two testicles, also known as testes. Testicles reside in the scrotum, attached at each end to the spermatic cord.