Final answer:
The highest loss of glacial ice volume occurred from 2000 to 2010, with significant reductions noted in Greenland's ice mass and in the number of glaciers in Glacier National Park.
Step-by-step explanation:
The greatest volume of glacial ice lost occurred in the ten-year span from 2000 to 2010. Glaciers have been retreating at an accelerated pace due to climate change, and this period saw some of the most significant reductions in glacial volume. For example, the mass of the ice sheets in Greenland decreased significantly, with Greenland losing between 150-250 km³ of ice per year between 2002 and 2006. Additionally, Glacier National Park, which had about 150 glaciers in 1850, was down to merely 24 glaciers greater than 25 acres in size by 2010. The Grinnell Glacier in this park, too, reduced in size by 40 percent between 1966 and 2005. Thus, the correct answer to the question is D) 2000-2010.