1、------by the advanced in technology,many farmer have set u

1、______by the advanced in technology,many farmer have set up wind farms on their land.
A、Being encouraged B、Encouraging
请问为什么不可以选A?B选项可以用ing形式表被动吗?
2、In April,thousands of holidaymakers remained ______ abroad due to the welcome ash cloud.
A、stuck B、to be stuck C、to have stuck
请问为什么选A?remain 这个词的用法又是什么?
我英语不大好,请回答者解释得详细清楚一点.