The concentration of an organic compound in chloroform is $6.15 \ g$ per $100 \ mL$ of solution. $A$ portion of this solution in a $5 \ cm$ polarimeter tube causes an observed rotation of $-1.2^{\circ}$. What is the specific rotation of the compound?
- A$+12^{\circ}$
- B$-3.9^{\circ}$
- C$-39^{\circ}$
- D$+61.5^{\circ}$
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