In an ${A^{+}}{B^{-}}$ ionic compound, the radii of ${A^{+}}$ and ${B^{-}}$ ions are $180 \ pm$ and $187 \ pm$ respectively. The crystal structure of this compound will be:

• A
  $NaCl$ type
• B
  $CsCl$ type
• C
  $ZnS$ type
• D
  Similar to diamond