请前辈们指点一道关于平行、同位语和定语从句的一个题目。

onlykevin

Manhattan 的一到练习题。#1为题干，#2为标准答案，#3是我自己想的，感觉我这样直接用同位语解释也可以，也保持了平行，不知道对不对，请前辈指正。
1.WRONG:
Tobacco companies, shaken by a string of legal setbacks in the United States, but which retain strong growth prospects in the developing world, face an uncertain future.
2.RIGHT:
Tobacco companies, which have been shaken by a string of legal setbacks in the United States, but which retain strong growth prospects in the developing world, face an uncertain future.
3.WHAT ABOUT THIS ONE：
Tobacco companies, shaken by a string of legal setbacks in the United States but retaining strong growth prospects in the developing world, face an uncertain future.