In a team meeting, Alex says, “If we don't run subway ads this month, the app downloads will definitely drop.” However, end-of-month data shows downloads hit a new high. Puzzled, a colleague asks about it, and Alex replies, “It must be due to bot traffic; otherwise, there's no other explanation.” Which of the following evaluates the reasoning most accurately?

Answer: A

• AAlex treats “ads bring downloads” as the sole cause, ignoring other avenues like word-of-mouth and app store recommendations.✓ Correct. Alex first infers from “no ads” to “downloads will drop,” and when this is contradicted, asserts “it must be bot traffic,” thus consistently ignoring other possible reasons for downloads, which is the fallacy of denying the antecedent.
• BAlex first claims downloads will drop, then changes to claim bot traffic, which is self-contradictory reasoning.✗ This conflates inconsistency in statements with a formal fallacy. Alex's two statements do conflict, but the core flaw is that his reasoning only considers the ad path, not simply a self-contradiction.
• CAlex assumes that if ads are run, downloads will certainly increase, which is an erroneous affirmation of the consequent.✗ This misunderstands affirming the consequent. Alex does not state that running ads ensures success; he merely treats not running ads as a sufficient condition for downloads to drop, which is a denial of the antecedent error.
• DAlex insists that without ads, downloads should not rise, which is actually a correct identification of data anomaly.✗ This confuses reasonable questioning with a logical error. The data may indeed deviate from expectations, but “without ads, downloads should not rise” overlooks multiple normal causes; one cannot bypass the reasoning flaw merely because the data is anomalous.