JEE Mains 2020 Model Paper 3 New Pattern

The atomic numbers of elements A, B, C and D are z-1, z, z + 1 and z + 2, respectively. If 'B' is a noble gas, choose the correct statement among the following statements
(I) 'A' has higher electron affinity
(II) 'C' exists in +2 oxidations state.
(III) 'D' is an alkaline earth metal.