Which of the following has largest radius?

Options

A. `1s^(2), 2s^(2),2p^(6),3s^(2)`
B. `1s^(2), 2s^(2), 2p^(6), 3s^(2), 3p^(1)`
C. `1s^(2), 2s^(2), 2p^(6), 3s^(2), 3p^(3)`
D. `1s^(2), 2s^(2), 2p^(6), 3s^(2), 3p^(5)`

Answer

A