to investigate what the effects （changes in working conditions would have ）on workers\' performance
断句+化简： to investigate what the effects on worker\'s performance
可不就是没有谓语嘛
what + the effects on 确实没谓语
"what the effects" is ungrammatical.
also, in constructions of this sort, "what" is generally redundant / unnecessary; it's better merely to say "to investigate X" rather than to say "to investigate what X is" (or other such wordy construction).
1. 时态上，AE都有错，主句has／had appeared，后面从句was，就是错误的。这里从句应该与主语时态是一致的。
2 在we have now realized已经是现在完成，意味着在过去某个时间点之前我们都以为ozone是 immune from human influence，自然应该用过去完成时态。
3. it appeared后面加从句it blah blah是redundant，appear作为系动词，后面可以直接加形容词做表语。这样最为简洁清楚。
A: Although the humps probably will not reduce the speed within the speed limit, they can reduce the speed somehow.
B: emergency vehicles- the side effect of the plan. The drawback is not a deal breaker, however, it does not have to be. The key is to attack the plan, but it doesn't necessarily mean to destroy it.
观点：Therefore, Salcor lacks any financial incentive to provide similar encouragement to Renco employees.
因果推理——削弱结论
也就是说找一个条件说明需要对R进行检查【如果R的员工都跑去了G，那么R如果不买保险，到最后还是得保险公司帮忙治啊】
我选了E 和楼下说的一样...我就是脑补了年纪大了容易胆固醇高 气死了！！！！！！！！！
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to investigate what the effects （changes in working conditions would have ）on workers\' performance
断句+化简： to investigate what the effects on worker\'s performance
可不就是没有谓语嘛
what + the effects on 确实没谓语