If Global Warming Proceeds During the Next Century as Anticipated

Multiple Choice

If global warming proceeds during the next century as anticipated, the polar ice caps may melt, substantially raising sea levels around the world (and flooding coastal cities such as New York and New Orleans) . What effect will this have on the duration of the day?

A) It will lengthen the day slightly.
B) It will shorten it slightly.
C) It will have strictly no effect.