The factors of each term in the expression 8x + 12xy are shown below.

8x: 1, 2, 4, 8, x
12xy: 1, 2, 3, 4, 6, 12, x, y

What is the greatest common factor of 8x and 12xy?

A. 2
B. 2x
C. 4x
D. 8x

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