The rule in this shape is a back and forth pattern that is repeating itself between the letters with curves and letters with straight lines.
If we look closely and break down the given shape as below:
BE, CF, DH, GLIn BE, the letter B is curve shaped while E is composed of straight lines.In CF, the letter C is curved shaped while F has straight lines.In DH, the letter D is curved one while H has straight lines.In GH, the letter G has curve while H has straight lines.
b is the answer that makes most sense
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