Answer:
B. No fallacy
Explanation:
First of, we need to know what a fallacy is. A fallacy is a mistaken belief, especially one based on unsound arguments.
A sound argument is an argument in which the truth in the premises are used to deduce the conclusions. While an unsound argument, makes use of premises that are not true.
With these, we can determine if the argument in the question was a sound argument. If it was, it won't be fallacious.
There is truth in the fact that the slim tea made Barbara loose 15 pounds after taking it for the stated period of time.
Therefore, concluding that someone with the same buildup as Barbara will have the same results, after taking the tea for the same period of time, is logical and not fallacious. This is because the premise is a true fact that has been tested, and the conclusion was drawn from the true premise.
This makes the argument a sound argument, with no fallacy