PT 65 S4 Q12

The best jazz singers use their voices much as hornplayers use their instruments. ... ...

Which one of the following most accurately describes the role played in the argument by the claim that the best jazz singers use their voices much as horn players use their instruments?
(A) It is the argument’s main conclusion and is supported by another statement, which is itself supported by a further statement.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Dec 2011 LSAT (PT 65): Logical Reasoning B