If solubility product of Zr3(PO4)4 is denoted by Ksp and its molar solubility is denoted by S, then which of the following relation between S and Ksp is correct?

• A. \({\rm{S}} = {\left( {\frac{{{{\rm{K}}_{{\rm{sp}}}}}}{{144}}} \right)^{1/6}}\)
• B. \({\rm{S}} = {\left( {\frac{{{{\rm{K}}_{{\rm{sp}}}}}}{{6912}}} \right)^{1/7}}\)
• C. \({\rm{S}} = {\left( {\frac{{{{\rm{K}}_{{\rm{sp}}}}}}{{929}}} \right)^{1/9}}\)
• D. \({\rm{S}} = {\left( {\frac{{{{\rm{K}}_{{\rm{sp}}}}}}{{216}}} \right)^{1/7}}\)