Hi Slavake! Happy to help you with this question
First, let's break down the structure of the argument:
Premise 1: The club's president conducted a survey during a Tuesday meeting of all members present.
Premise 2: 95% of the members at that Tuesday meeting said that they could make Tuesday meetings without difficulty.
Conclusion: The attendance problem is not a result of schedule conflicts.
Since this is a flaw question, we want to prephrase an issue with the argument that casts doubt on the validity of the conclusion. The stimulus relies on survey data, so we want to think of the several common survey errors: biased sample; improperly constructed survey questions; and inaccurate responses from respondents.
In the stimulus, the club's president concludes that problems with attendance at Tuesday meetings is not due to schedule conflicts. He bases that conclusion on a survey conducted of members that attended one of the Tuesday meetings. However, this can't be a representative sample to determine whether there are generally schedule conflicts with Tuesday meetings. If someone is attending this meeting on a Tuesday, then it is highly unlikely for them to respond to the survey that they have a schedule conflict with Tuesdays. In other words, the argument in the stimulus relies on a biased sample.
Answer choice (B) matches our prephrase and describes the flaw of a biased sample. By making a conclusion about members in general based on a survey of members that attended a Tuesday meeting, the club's president is generalizing from an unrepresentative sample.
Answer choice (D) is incorrect because none of the premises offered contradict one another. There is no contradiction between surveying members present at a Tuesday meeting and finding that 95% of the members sampled do not have difficulty attending Tuesday meetings. The 5% that reported that they do have difficulty attending Tuesday meetings can be explained by the following situation: these members usually wouldn't attend Tuesday meetings because of a scheduling conflict but happened to be able to make it to that particular Tuesday meeting and so were included in the survey sample.
To sum up, prephrasing on flaw questions will almost always be helpful in determining the right answer choice! In this case, answer choice (B) matched our prephrase.
I hope this helps, and let me know if you have any further questions!
