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Answer:
Option B
Explanation:
Option A, C and D have x- values that repeat and you cannot have that.
Y values can repeat but not x-values.
Option B has all x values with different y-values
B.
an output can have more than one input but an input can only have one output
basically only one arrow can go from the input to the output and b is the only one who's graph thing is like that
hope this helps <3