If Sarah were a concert pianist for a major orchestra, she would be fa

Facts given are
All concert pianists in a major orchestra are famous.
Sarah is not famous.
Let’s analyse the options.
A - This option says she is famous. WRONG
B – Individually this might seem correct, but it is important that the option be coherent with the given passage. Let’s try to club the option and the passage together and check if it makes sense. The author here is concluding that she is not a concert pianist since she is not famous. If he considers she is a harpist for a major orchestra it still wouldn’t provide any more relevant information. WRONG
C – We don’t know if a pianist with a rock group are famous or not. It is possible that she could be a pianist with a rock group and not be famous. Let’s keep this option in the basket and look at other options as well.
D – The same reasoning as C.
E – This option implies Sarah is famous. WRONG

We are now left with options C and D.
This question is flawed in my opinion, both options seem to be correct.