d = a5 - a4 = 2 - 3.8
d = - 1.8
a1 = 9.2 (given) so that A and B are both incorrect
an = 9.2 + (n - 1)*(d)
an = 9.2 + (n - 1)*(-1.8)
You need not go any further. The answer is D
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