Although improved efficiency in converting harvested trees into wood products may reduce harvest rates, it will stimulate demand by increasing supply and lowering prices, thereby boosting consumption.红色字为划线部分,我选A,可正确答案为in converting harvested trees into wood products may reduce harvest rates, demand will be stimulated because of increasing supply and lowering prices, which boost我明白正确答案没错,可原文错哪了呢?it指代efficiency主动stimulate,不是比demand被动要好么??