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This question is one of the 59 we have for the Doubles & Triples CDL knowledge test. The official AAMVA Commercial Driver License Manual chapter on Doubles & Triples covers exactly this topic, and most state DMV exams pull from the same chapter. Memorizing the right answer is fine for passing, but understanding the underlying rule is what keeps you safe on the road and out of trouble with FMCSA inspectors.
If this topic gave you trouble, take the full Doubles & Triples practice test to drill it across all the related questions. We recommend reading every explanation, even on the questions you got right, because the manual phrasing in the explanation often shows up word-for-word on the real exam.