When $50cm3$ of a saturated solution of a sugar (molar mass $342.0g$ / at $404c$ was evaporated to dryness $31.2g$ of dry solid was obtained. The solubility of sugar at ${40}^{\circ }C$ is _____________

A. $10.0$ moles $c{m}^3$
B. $7.$ Omoles $d{m}^{-3}$
C. 3.5 moles dm \(dm ^{-3}\
D. 6 moles $d{m}^{-4}$  

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Correct Answer: D