Because 3 = k/4 you can do any correct operation on both sides of an equation and it will still be equal. So you can multiply by 4.
k= 12
y = 12/x and because x=2.
y = 12/2 = 6
So the answer is C.
Hope this helps and I only two more brainliest to reach virtuoso it would really really help so much, I appreciate and sincerely hope you have a great day, thanks in advance ;)