The solubility product of Cr(OH)₃ at 298 K is 6.0 × 10⁻³¹. The concentration of hydroxide ions in a saturated solution of Cr(OH)₃ will be ?

A. (18 × 1010⁻³¹)¹/⁴
B. (2.22 × 1010⁻³¹)¹/⁴
C. (4.86 × 10⁻²⁹)¹/⁴
D. (18 × 1010⁻³¹)¹/²