OG12-73 求版主帮帮忙

73. Combning enormous physical strength with higher intelligence, the Neanderthals appear as equipped for facing any obstacle the environment could put in their path, but their relatively sudden disappearance during the Pa;eolithic era indicates that an inabilityto dapt to some environmental change led to their extinction.
a, appear as equipped for facing any obstacle the environment could put in their path
b, appear to have been equipped to face any obstacle the environment could put in their path
c, appear as equipped to face any  obstacle the environment could put in their pahts
d, appeared as equipped to face any obstacle the environment could put in their paths
e, appeared to have been equipped for facing any obstacle the environment could put in their path.
答案B
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1. appear as equipped, appear-ed as equipped, & appear to have been equipped这三个phrase意思上有什么区别啊？OG里说有的imply现在仍然这么穿， 有的讲以前这么穿，。。。，不是非常清晰。
2. OG答案说之所以用appear是为了与后边indicates平行， 另外也表示这是current evidence about Neanderthals in the past。 我对这个“current evidence”有点疑惑，麻烦您帮我elaborate一下。。要是我用appeared 和 indicated也正确吧？其实我觉得用过去式最好！！
3. 另外我觉得其实即便时态不一样（i.e., appeared & indicate）， 也是可以parallel的啊（只要逻辑上同就行啊。。）版主觉得呢？