求助GWD-TN2-Q10

Antarctica receivesmore solar radiation than does any other place on Earth, yet the temperaturesare so cold and the ice cap is reflective, so that little polar ice meltsduring the summer; otherwise, the water levels of the oceans would rise 250feet and engulf most of the world’s great cities.

A.   is reflective, so that little polar icemelts during the summer; otherwise,

B.   is so reflective that little of the polarice melts during the summer; were it to do so,

C.   so reflective that little polar ice meltsduring the summer, or else

D.   reflective, so that little of the polar icemelts during the summer, or

E.    reflects so that little of the polar icemelts during the summer; if it did