The surface area, sa, of a right circular cone is sa=pi r squared + pi r s, where r is the radius of the circular cone and s is the slant height. using rounding to the nearest whole number, which of the following is an estimate of the volume of a cylinder with a radius of 4.42 meters and a slant height of 2.61 meters?
a: 84
b: 111
c: 125
d: 150