Is the relation shown in the arrow diagram a function? Two oval shapes containing sets of numbers with arrows showing the link between them. The numbers within the left oval are 27, 39, 31, 27, and 60. The numbers within the right oval are 130, 45, 67, 123, and 180. The relations between the left and the right numbers are: 27 linked to 123, 39 linked to 180, 31 linked to 67, 27 linked to 45, and 60 linked to 130.

Choose the correct response.
A.

Yes. Every unique input has a unique output.
B.

Yes. Every input maps to more than one output.
C.

No. Not every input maps to an output.
D.

No. Not every unique input maps to only one unique output.