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What extacly does “were it to do so” indicate in option B ?

Antarctica receives more solar radiation than does any other place on Earth, yet the temperatures are so cold and the ice cap is reflective, so that little polar ice melts during the summer; otherwise, the water levels of the oceans would rise 250 feet and engulf most of the worldâ€™s great cities.

a)  is reflective, so that little polar ice melts during the summer; otherwise,
b)  is so reflective that little of the polar ice melts during the summer; were it to do so,
c)  so reflective that little polar ice melts during the summer, or else
d)  reflective, so that little of the polar ice melts during the summer, or
e)  reflects so that little of the polar ice melts during the summer;if it did

Right Ans is B .