The correct sequence of increasing covalent character is represented by:

Step-by-step solution

According to Fajan's Rule, 1. Smaller the size of cation, the larger the size of the anion, greater is the covalent character of the ionic bond. 2. Greater the charge of cation, greater is the covalent character of the ionic bond. 3. For cations with same charge and size, the one, with (n-1) d^n n s^ which is found in transition elements have greater covalent character than the cation with n s^2 n p^6 electronic configuration, which is commonly found in alkali or alkaline earth metals. Thus, order of covalent chara