prep08 sc204关于指代的问题

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204. (T-9-Q16) (OG12-53)
The nineteenth-century chemist Humphry Davy  presented the results of his early experiments in his
“Essay on Heat and Light,” a critique of all chemistry since Robert Boyle as well as a vision of a new
chemistry that Davy hoped to found.
A.  a critique of all chemistry since Robert Boyle as well as a vision of a
B.  a critique of all chemistry following Robert Boyle and also his envisioning of a
C.  a critique of all chemistry after Robert Boyle and envisioning as well
D.  critiquing all chemistry from Robert Boyle forward and also a vision of         
E.  critiquing all the chemistry done since Robert Boyle as well as his own envisioning of

想问的是B中为什么his 没有指代不是就指 chemist Humphry Davy 麽？(B.  critique与his envisioning不平行；envisioning有具体的名词形式即vision，应直接用名词；his指代不清 )
指代什么时候才有效？

谢谢！

lexuefeifelix

his可能指代Robert Boyle...意思可以变成是对all chemistry following robert boyle和robert boyle的vision的critique