(C) The strength of the $C-X$ bond depends on the bond length. As the size of the halogen atom increases from $F$ to $I$,the bond length increases,whi

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(C) The strength of the $C-X$ bond depends on the bond length. As the size of the halogen atom increases from $F$ to $I$,the bond length increases,which leads to a decrease in bond strength.The order of bond strength is: $CH_3F > CH_3Cl > CH_3Br > CH_3I$.Therefore,the $C-F$ bond in $CH_3F$ is the strongest.