Let's begin by listing out the information given to us:
Initial number = 20
Add 6's = the number increases by 6
20 + 6 = 26
26 + 6 = 32
32 + 6 = 38
38 + 6 = 44 (not 43)
As such, 43 is not in the sequence. Hence, option D is the correct answer
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