Simplify the argument-
fossils of species that still exist were selected and dated --> the known temperature tolerances of the existing beetle species were used to determine the maximum summer temperature that could have existed at that place and period.
Option A - Incorrect.
No such assumption is required to measure the maximum summer temperature. Even if they could tolerate cold temperatures better, the argument still stands.
Option B - Incorrect.
Not true. look at what the argument says
...
fossils of species that still exist were selected and dated --> the known temperature tolerances of the existing beetle species were used to determine the maximum summer temperature that could have existed at that place and period.
Option A - Incorrect.
No such assumption is required to measure the maximum summer temperature. Even if they could tolerate cold temperatures better, the argument still stands.
Option B - Incorrect.
Not true. look at what the argument says
...
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