The official answer is "c", however I thought that the answer was "a" as I thought that the second Catherine should be "she". I'd appreciate if someone could explain this.
Catherine travels a great deal with her mother and this is the reason she isn’t available to lead the city Finance Committee.
a) this is the reason she isn’t available to lead b) this is why she isn’t available in leading c) this is the reason that Catherine isn’t available to lead d) this is the reason Catherine isn’t available to lead e) might this be the reason that she can’t lead
Top answer
With appropriate initial capital letters and final punctuation, all except (b) are possible.
— Fivejedjon
With appropriate initial capital letters and final punctuation, all except (b) are possible.
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Thank you, fivejedjon, Now I understand that "she" on the question sentence should be Catherine to avoid confusion of the possibility that when using "she", you do not know "she" means Catherine or her mother.