A is not a line of symmetry
In exponential for it could be 10 raised to the 5th power or 10^5
9 : 2 = 18 : 4
As: 9 x 2 : 2 x 2 = 18 : 4
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36 : 8 = 18 : 4
As: 18 x 2 : 4 x 2 = 36 : 8
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72 : 16 = 18 : 4
As: 18 x 4 : 4 x 4 = 72 : 16
