The asthenosphere is a part of the upper mantle just below the lithosphere that is involved in plate tectonic movement and isostatic adjustments. During as ice age

A)Ice floats on the asthenosphere.

B)Continents float higher on the asthenosphere.

C)Continents sink deeper into the asthenosphere.

D)The oceans rise due to floating of the asthenosphere.

B) Continents float higher on the asthenosphere.

Explanation:

We are living in an ice age, a time period of reduction in Earth's temperature that leads to the expansion of continents and ice sheets.

The asthenosphere is present just below the lithosphere and continents float higher on the asthenosphere due to differences in the densities. Continents are consist of granite which has very less density than the asthenosphere, that allows continents to float over the asthenosphere .

Hence, the correct answer is "B) Continents float higher on the asthenosphere."