A person explains an entrepreneur's success only through luck and ignores years of preparation. What error is this?

Correct answer: Reducing a complex outcome to one cause

Direct answer: Option B is correct. Entrepreneurial success usually has several connected causes, such as preparation, hard work, skills, planning, opportunity, decisions, resources, support, timing, and sometimes luck. Saying that success happened only because of luck reduces a complicated outcome to one cause and ignores the preparation that made the opportunity useful. Option A is wrong because preparation improves chances but does not make success certain; conditions and decisions also matter. Option B is correct because it names the reasoning error: explaining a complex result through only one factor. Option C is wrong because the statement does not reject luck completely; it rejects the claim that luck alone explains everything. Option D is wrong because the person is not overestimating effort but ignoring it. A useful memory cue is: success is usually a combination, not a single magic cause. Look for words such as “only,” “entirely,” or “always,” because they often signal an unfair generalisation.