[" Which of the following is an energy consuming process? "],[[" (a) "0_((g))+e^(-)rarr O_((g))^(-)," (b) "Na_((g))^(+)+e^(-)rarr Na_((g))],[" (c) "O_((g))^(-)+e^(-)rarr O_((g))^(2)," (d) "0_((g))^(2-)rarr0^(-)+e^(-)]]