Respuesta :
It is the first one, prevents sperm from reaching the egg and fertilizing it :) (made fairly obvious in the question where it states they are blocked/severed.)
The permanent sterilization prevents sperm from reaching the egg and fertilizing it.
What is sterilization?
Sterilization is the process of permanent birth control.
The women sterilization process s called tubal ligation.
Tubal ligation closes all the Fallopian tubes, so that sperm could not reach the uterus of the women.
The men sterilization is called vasectomy.
Thus, the correct option is A.
Learn more about sterilization
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