Which of the following is the better method for the preparation of $BeF_2$?
- A$(NH_4)_2BeF_4 \xrightarrow{\Delta} BeF_2 + 2NH_4F$
- B$BeH_2 + F_2 \xrightarrow{\Delta} BeF_2 + H_2$
- C$Be + F_2 \xrightarrow{\Delta} BeF_2$
- D$BeO + C + F_2 \xrightarrow{\Delta} BeF_2 + CO$
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