Critical Reasoning (CR) | Re: A compelling optical illusion called the illusion of velocity and size

KarishmaB
I am unable to eliminate D & E. How accuracy of estimation impact the argument?

(D) motorist’s estimate of time available is assumed to be more accurate with cars approaching than with trucks approaching
(E) motorist’s estimate of time available is assumed to be more accurate with trucks approaching than with cars approaching

Is it reasonable to say that D weakens the conclusion because we can't trust the estimated time of truck now. So conclusion can't be drawn.
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