In the preparation of compounds of Xe, Bartlett had taken `O_(2)^(+) Pt F_(6)^(-)` as a base compound. This is because
A. both `O_(2) and Xe` have same size
B. both `O_(2) and Xe` have same electron gain enthalpy
C. both `O_(2) and Xe` have almost same ionisation enthalpy
D. both `Xe and O_(2)` are gases.