This is a tough one for me...
[C] Sarah is not a concert pianist for a major orchestra
[P] Because she is not famous
[P] And all major concert pianists are famous
We know that "Sarah is not famous" is a given premise, so any answer choice that contradicts this are incorrect.
Eliminate A / E.
Sarah could play other instruments, or play piano in a rock band, but both cases supports the [C] that she is not a concert pianist in a major orchestra - in fact, these points supports the [C].
Eliminate B / CD is correct, because not being famous == not a concert pianist in a major orchestra != not a concert pianist. Sarah could still be a concert pianist, but in a different setting (eg minor orchestra).
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It's good to note here that this question assumes that you know a concert pianist is a classical pianist, not just one that performs concerts.
Even if you did not know this fact, D answers the question in a more direct manner compared to E.
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