Is the relation below a function? Explain

[(2,4),(-1,3),(0,2),(-2,0),(1,1)]
A. It is not a function because the domain of -1 has more than one range
B. It is not a function because the domain of -2 has more than one range
C. It is a function because each domain has exactly on range
D . It is a function because each range has exactly one domain

D. It is a function because each range has exactly one domain