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Three light sources $A, B$ and $C$ emit equal amount of radiant energy per unit time. The wavelengths emitted by the three sources are $450\ nm, 555\ nm$ and $700\ nm $ respectively. The brightness sensed by an eye for thesources are $X_A, X_B$ and $X_C$ respectively. Then,

• A
  $ X_A > X_B, X_C > X_B $
   
• B
  $ X_A > X_B, X_B > X_C $
   
• ✓
  $ X_B > X_A, X_B > X_C $
   
• D
  $ X_B >X_A, X_C > X_B$