题目选项分析

Automobile manufacturers defend their substitution of steel frames in cars with cheaper plastic components by claiming that consumer demand is ruled by a desire for light cars with crumple zones rather than as a result of corporate profit motives. However, if this trend were true, then carbon reinforced tubing, which is lighter than steel and stronger, would be available as an option. It is not.

Which of the following, if true, would most strengthen the argument against the automobile manufacturer's claim?

【选项】When carbon tubing was introduced in the market place, it was not yet commercially viable to produce it in large volumes.