It is C the mantle becauce the crust is the where we live I think of it as the crust of a sandwhich and the core it the center of the earth
Ben's latest journey will take him from Tokyo to San Francisco, and is set to last for five months. That's 5,500 miles worth of swimming, the first-ever attempt by someone to cross the Pacific in this way. Ben will be swimming eight hours<span> a day at the average speed of two to two and a half knots per hour</span>
A. at least I think it is
Hope this helps:) good luck!