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How was ABCDEFGH transformed to A'B'C'D'E'F'G'H'?

a
dilated by a scale factor of 1/3
b
dilated by a scale factor of 1/2
c
dilated by a scale factor of 2
d
dilated by a scale factor of 3

The question does not provide any information on how ABCDEFGH was transformed to A'B'C'D'E'F'G'H'. Therefore, it is impossible to determine which dilation factor was applied.