This question says that the pickup and the limousine can’t be placed Monday. Whenever a question placed restrictions on a spot, you should check what other restrictions exist.
Who else can’t go Monday? Not the sedan, the sedan must go between the pickup and the limousine.
Not the roadster and the hatchback, they must go after the van (rule 1). So none of the pickup, the limousine, the sedan the roadster or the hatchback can go first in this question:
Only the van can go Monday! C is CORRECT.
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