A cylinder with radius 2\:cm and height 8\:cm is full of water. A second cylinder of radius 4 cm and height 8\:cm is empty. If all of the water is poured from the first cylinder into the second cylinder, the depth of the water in the second cylinder will be
Answer Choices
A. 1\:cm
B. 2\:cm
C. 3\:cm
D. 4\:cm
E. 6\:cm