Choose the correct order of molar ionic conductivities of the following ions.

• A. Li⁺ < Na⁺ < K⁺ < Rb⁺
• B. Li⁺ < K⁺ < Rb⁺ < Na⁺
• C. Li⁺ < Na⁺ < Rb⁺ < K⁺
• D. Li⁺ < Rb⁺ < Na⁺ < K⁺