thesis plural

See full answer below.
What is the plural of thesis?

Even though you are the only person who wrote it, you should stick with plural, since it is more common and singular sound to “selfish.”

Thesis should be written in singular, since you are the single person one who wrote it and will defend it as your own work.

References:

http://academia.stackexchange.com/questions/18327/should-paper-thesis-be-written-in-plural-or-singular-1st-person?noredirect=1&lq=1
http://www.grammarly.com/blog/of-vs-off/