The correct option is D O2 molecule and Xe atom have very similar ionization energies.
Bartlett's main specialty was the chemistry of fluorine and of compounds containing fluorine. In 1962, Bartlett prepared the first noble gas compound, xenon hexafluoroplatinate. This contradicted established models of the nature of valency, as it was believed that all noble gases were entirely inert to chemical combination. He subsequently produced and reproduced several other fluorides of xenon.
The statement, which prompted Neil Bartlett to prepare the first noble gas compound was O2 molecule and Xe atom have very similar ionization energies.