[" 43.Which of the following can most easily form unipositive "],[" gaseous ion? "],[[" (a) "1s^(2)2s^(2)2p^(6)3s^(2)3p^(3)," (b) "1s^(2)s^(2)2p^(6)3s^(2)3p^(1)],[" (c) "1s^(2)2s^(2)2p^(6)3s^(2)3p^(1)," (d) "1s^(2)2s^(2)2p^(6)3s^(1)]]