HELP PLSSS

Is this relation a function? Justify your answer.
11
10
2
1
5 6 7 8 9 10 11
O A. No, because two points with the same y-value have different x-
values.
OB. Yes, because every x-value corresponds with a single y-value.
O C. Yes, because every x- and y-value is positive.
O D. Yes, because the number of x-values is the same as the number of
y-values.