Bruh, I read it as "The best jazz singers use their voices AS MUCH AS horn players use their instruments" instead of "much as" which led me to pick D... reminder to PAY ATTENTION when you read

@AveryClose From my understanding, if something is a premise, it can't also be an assumption. Assumptions are missing links between the premises and the conclusion. The argument contains a premise that states "Walt is a member of the Disney Vacation Club." We have no reason to believe otherwise, as the argument says he IS a member of the DVC.