Answer:
(A) Terrence Gurney is mistaken when he suggests that the wide appeal of his books has prevented him from being given due credit for his literary achievements.
Step-by-step explanation:
The argument's conclusion is that Terrence Gurney is "mistaken" because he believes that the reason why he has not received literary acclaim is that his books are popular. However, the real cause for not obtaining literary approval is that his writing is dull and does not have an impact on the readers.