What is the concentration of aluminum ion, [Al³⁺], in a solution obtained by adding solid aluminum nitrate, Al(NO₃)₃, to distilled water to achieve a nitrate ion concentration, [NO₃⁻], of 0.10 M?

A) 0.30 M
B) 0.10 M
C) 0.05 M
D) 0.20 M