(A) Due to the very small size and high ionization enthalpy of $Be^{2+}$ ion,it has a high polarizing power according to Fajan's rule. This results in

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(A) Due to the very small size and high ionization enthalpy of $Be^{2+}$ ion,it has a high polarizing power according to Fajan's rule. This results in significant covalent character in its compounds,unlike other alkaline earth metals which primarily form ionic compounds.