The correct answer c) No fallacy.
There is no fallacy when no incorrect or false meaning, logic, or factors are used in the development of an argument. There is no incorrect belief involved.
According to the question, no fallacy is requested for Clark's side because he has not made up any untrue statements; rather, his brain injury condition causes him to forget things. As a result, the testimony should be canceled.
Other choices are inappropriate since the situation does not reflect appeals to ignorance, pity, unqualified authority, and argument against the individual, circumstantial. Thus, the correct option is option (c).
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