Rubidium-86 (86rb) undergoes beta decay. A 9.52 x 10−5 mol sample of 86rb emits 8.87 x 1016 beta particles in one hour. Calculate the half-life (in hours) for 86rb.

A) 1.2 x 10^3
B) 2.4 x 10^3
C) 3.6 x 10^3
D) 4.8 x 10^3