There are several reasons to eliminate A and chooseB.
so X as to Y implies that Y SEEMS TO BE TRUE.
Officialexamples:
Climatic shifts are so gradual as to be indistinguishable from ordinary fluctuations in the weather.
The features of the idealized sculpture portrait are so unrealistic as to constitute what one scholar calls an "artificial face. quot;
In each case, the blue portion is something that SEEMS TO BE TRUE about the preceding subject in red.
so X that Y implies that Y ACTUALLY
...
so X as to Y implies that Y SEEMS TO BE TRUE.
Officialexamples:
Climatic shifts are so gradual as to be indistinguishable from ordinary fluctuations in the weather.
The features of the idealized sculpture portrait are so unrealistic as to constitute what one scholar calls an "artificial face. quot;
In each case, the blue portion is something that SEEMS TO BE TRUE about the preceding subject in red.
so X that Y implies that Y ACTUALLY
...
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