Answer:
1. Do not carry too many baggages.
Ans. Do not carry too many bags.
2. The road condition were very bad.
Ans. The road condition was very bad.
3. Do you have any feedbacks on this plan?
Ans. Do you have any feedback on this plan?
I believe it would be C. line. A column is used to hold up structures, and they always stand up straight. So yes, line is your answer