Lattice energy of NaCl is 'X'. If the io...

Lattice energy of NaCl is 'X'. If the ionic size of `A^+2` is equal to that of `Na^+` and `B^-2` is equal to `Cl^-`, then lattice energy associated with the crystal AB is (assume all other constants are equal for both the compounds)
A) X
B) 2X
C) 4X
D) 8X

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