The correct option is A Hologamy
Trichonympha is a genus of parabasalid protists that live in the intestine of many termite species. They are symbiotes as they break down cellulose in the wood and plant fibers that their hosts eat. They exhibit hologamy, meaning, while sexually reproducing, the gametes produced are of the same size and structure as the somatic cells.
Thus, the correct answer is option (A).