题目选项分析

The price of titanium dioxide, a key ingredient in house paint, is increasing due to limited supplies because many mining companies that once produced titanium ore have shifted production to other ores. Without titanium dioxide, paint colors are less bright and more coats of paint must be applied to compensate. Companies that produce paint have concluded that they will soon need to increase the prices on the paint they produce. Which of the following would, if true, most strongly support the companies` conclusion?

【选项】Because of recent increases in the price of titanium ore, mining companies that shifted production to other ores are now shifting back to producing titanium ore.