Solution
Object A
[tex]0.000001877pc\cdot\frac{31x10^{12}\operatorname{km}}{1pc}=5.8187x10^7\operatorname{km}[/tex]Object B
[tex]30AU\cdot\frac{1.5x10^8\operatorname{km}}{1AU}=4.5x10^9\operatorname{km}[/tex]Object C
[tex]778.3x10^6\operatorname{km}=7.783x10^8\operatorname{km}[/tex]