(B) Electronegativity increases across a period from left to right due to an increase in effective nuclear charge and a decrease in atomic size. For t

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Increases from carbon to fluorine

(B) Electronegativity increases across a period from left to right due to an increase in effective nuclear charge and a decrease in atomic size. For the elements $C$,$N$,$O$,and $F$,which belong to the same period ($2^{nd}$ period),the electronegativity increases as we move from $C$ to $F$. Therefore,the order is $C < N < O < F$.