Which condition is a cause of impotency in men? undescended testicles that persist beyond puberty the inability of the penis to become erect a vasectomy, which is a surgical procedure to cut the vas deferens a low production of sperm in the testes the absence of the vas deferens in a male from birth

the inability of the penis to become erect

Impotence is the same as erectile dysfunction, which is the inability to get or maintain an erection long enough to have sexual intercourse.  In most cases is temporary but can still have a negative effect on the person's sex life. The other options don't influence the blood flow that goes to the penis, to create the erection.