Statement (A): p – p overlapping is present in $C{l}_2$  molecule.

Statement (B):  s – p overlapping is present in HCl molecule.

Statement (C): s – s overlapping is present in  $I_2$ molecule

In  $C{l}_2$ molecule unpaired electrons of  $3p_z-3p_z$  orbitals of two chlorine atoms overlapped.

In HCl molecule 1s orbital of hydrogen and  $3p_z$ orbital of chlorine atom overlapped.

In  $I_2$ molecule p – p overlapping is present, but not s – s overlapping.