Titillate is the correct way to spell it because it doesn't have two t's between the the two i's. So D. is you official answer. Hope this helps :)
~Shadow
Answer:
(of a person) fond of company; sociable. (of animals) living in flocks or loosely organized communities. (of plants) growing in open clusters or in pure associations. (synonym)companionable antonym unsociable
Explanation:
