Final answer:
Prostatitis is the most common bacterial nonsexually transmitted infection of the male reproductive system, causing inflammation of the prostate gland and requiring medical treatment that typically includes antibiotics.
Step-by-step explanation:
The most common bacterial nonsexually transmitted infection of the male reproductive system is B) Prostatitis. This condition is caused by a bacterial infection and is characterized by inflammation of the prostate gland. Signs and symptoms include fever, chills, and pain in the pelvic area, with difficulties during urination and potentially painful ejaculation. While other infections such as cystitis, nephritis, and pyelonephritis affect different parts of the urinary tract, prostatitis specifically targets the male reproductive system and is not usually sexually transmitted. It is important to consult a healthcare provider for diagnosis and appropriate treatment, which may include antibiotics and other therapies.