Nowadays, we often come across cases of admission to institutions through counterfeit certificates and documents.

Answer: Option D

One word substitute is Forgery.

Stoicism: the endurance of pain or hardship without the display of feelings and without complaint.
Pugnacity: natural disposition to be aggressive or belligerent.
Epitaph: a phrase or form of words written in memory of a person who has died, especially as an inscription on a tombstone.
Forgery: a forged document, signature, banknote, or work of art.