RaghavSingla wrote:
I think A is incorrect. A states: The first is evidence to support a conclusion; the second is a reason for questioning that support.
The first is indeed an evidence to support a conclusion (these design changes must be worth the incremental costs). But the second bold part "major engine manufacturers always purchase any new engine design for evaluation" is not questioning that support. It is questioning the conclusion of the first evidence. It is not questioning that whether new turbine
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