Which of the following statements can make deductive reasoning incorrect?

• A. The conclusion is not relevant to the premises
• B. The major premise is a false statement
• C. The minor premise is too general
• D. All premises are true

Answer: (B)

Deductive reasoning is a logical process in which a conclusion is drawn from general premises that are assumed to be true. If the major premise is false, the entire argument can be flawed, making the conclusion drawn from it potentially incorrect. In deductive reasoning, the strength of the conclusion heavily relies on the truth of the premises.

Therefore, if the major premise, which provides the general rule or statement, is false, then it undermines the validity of the reasoning. The conclusion may not logically follow from a false major premise, regardless of the truth of the minor premise. This means that even if the minor premise is accurate, it does not guarantee that the conclusion will be correct if the foundational major premise is unreliable.

In contrast, the relevance of the conclusion to the premises, the generality of the minor premise, and the condition of all premises being true do not inherently make deductive reasoning incorrect if the structure of the argument is sound. Hence, the truth of the major premise is crucial for maintaining the integrity of deductive reasoning.