Which of the following could not cause an unfavorable materials quantity variance? malfunctions in production equipment that damaged units in process and required them to be reproduced. changes to the raw materials supplier's ordering process that require larger batches of materials to be ordered at any given time. delays in the production process that led to raw materials "spoiling" before they could be used. poorly trained workers All of the other choices could cause an unfavorable materials quantity variance. More than one of the other choices could cause an unfavorable materials quantity variance