The correct option is A The couple is unable to produce offspring in spite of unprotected sexual cohabitation.
Infertility is the inability to produce offspring in spite of unprotected sexual cohabitation. It can be caused due to physical, congenital, immunological or psychological disorders in either male or female partner or both. But unfortunately, in India often the females are blamed for the couple being childless.
Several methods are available called assisted reproductive technology (ART) to help such couples to successfully conceive.