A particle mass is tied to an ideal string and whirled in a vertical circle of radius L, where L is off-course the length of the string. If the ratio of the maximum to minimum tension in the string throughout the motion is 2 : 1, then the maximum possible speed of the partcle will be:
A. `sqrt(11 gL)`
B. `sqrt(5 gL)`
C. `sqrt(10 gL)`
D. sqrt(3 gL)`