[求助]GWD-6-Q16

Q16:

Not only did the systematic clearing of
forests in the United States create farmland (especially in the Northeast) and
gave consumers relatively inexpensive houses and furniture, but it also caused erosion and very quickly deforested whole regions.

1. Not only did the systematic clearing of forests in the United States
        create farmland (especially in the Northeast) and gave consumers
        relatively inexpensive houses and furniture, but it also
2. Not only did the systematic clearing of forests in the United States
        create farmland (especially in the Northeast), which gave consumers
        relatively inexpensive houses and furniture, but also
3. The systematic clearing of forests in the United States,
        creating farmland (especially in the Northeast) and giving consumers
        relatively inexpensive houses and furniture, but also
4. The systematic clearing of forests in the United States
        created farmland (especially in the Northeast) and gave consumers
        relatively inexpensive houses and furniture, but it also

这个题目好象是个争议题，一直没见定论，建议查一查讨论帖子

B的意思是有问题的