Statement (A) : Electro negativity of ${\text{Fe}}^{\text{3+}}$ is greater than electro negativity of ${\text{Fe}}^{\text{2+}}$.

Statement (B) : Screening effect increases as the Electro negativity decreases.

Statement (C) : The highest electronegative element is F.

Statements 1,2 & 3 are correct statements   as follows Electro negativity of ${\text{Fe}}^{\text{3+}}$ is greater than electro negativity of ${\text{Fe}}^{\text{2+}}$   Screening effect increases as the Electro negativity decreases, The highest electronegative element is F.