Welcome to my contest #2 ! Take your share of 50% of upvotes

This is my second contest, i need to know what is the right symbol in the equation.

To enter this contest you have to upvote the post and comment with the right answer as A B C or D.
Please keep it simple and do not explain how you found the right answer, if you do you will NOT get the prize !
After 7 days i will distribute the prize to the winners.
The prize will be 50% of the sbd made with the post.
Only one entry per person is allowed!
Cheers and Good luck everyone :)