<h3>Hm, well lets see... I'll start by breaking it down into parts first:</h3>
Blue + Yellow= Green
Blue + Red= Purple
Green + Purple= A blueish grey
That removes Mustard and Black.
<u>I think the answer is D.</u>
If I am wrong, then the answer will have to be Grey.
I apologize in advance.
If I am wrong, I will come back and edit my answer until it is correct.
<h3>Now, if you like this answer and would like to see more like it, please make sure to Like, Comment, and Rate this answer! Also, be sure to send me a friend request. I'm always up for a challenge!</h3><h2>Thanks!</h2>