Which of the following does NOT represent a

Which of the following does NOT represent a cause-and-effect relationship?
A) Material costs increase as the number of units produced increases.
B) A company is charged 40 cents for each brochure printed and mailed.
C) Utility costs increase at the same time that insurance costs increase.
D) It makes sense that if a complex product has a large number of parts it will take longer to assemble than a simple product with fewer parts.