Question 1183473
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Rewrite the second inequality as<br>
a < b+8<br>
Then note that the phrasing of the question implies that exactly one of the answer choices is correct.<br>
Since "a < b+8" has to be true for only one of the answer choices, the answer has to be the largest (least negative) of the choices.  So the answer has to be D, -6.<br>
For a correct algebraic solution to the problem, see the response from tutor @ikleyn.<br>