5. Citing the recent increase in earning by several computer companies, economists feel that a cycle has begun in which personal computer users, especially corparate consumers, are replacing their PC's with more powerful models. A.a cycle has begun in which personal computer users, B. a cycle for personal computer users has begun in which they 为什么选A ?我选的是B
Citing the recent increase in earning by several computer companies, economists feel that a [B]cycle for personal computer users has begun in which they, especially corparate consumers, are replacing their PC's with more powerful models.
they are replacing their PC's with more powerful models. 主语不是还是 users 么符合逻辑呀? they可以指代 economists么?