Among CaH2 , BeH2 , BaH2 , the order of ionic character is

1. A. BeH2 < BaH2 < CaH2
2. B. CaH2 < BeH2 < BaH2
3. C. BeH2 < CaH2 < BaH2
4. D. BaH2 < BeH2 < CaH2

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