$Xe>Kr>Ar>Ne>He$. This order represents:

The correct options are
A Solubility in water
B Enthalpy of vaporisation
(a) Solubility increases as size increases. Noble gases are soluble in water because of dipole-induces dipole interactions. As size increases it will be easily polarised by water.

(b) As size increases, the enthapy of vapourisation increases. This is because of the increase in the van der Waals forces of attraction between the gaseous particles.