Step 1: Use position in the table
Fluorine sits at the top right of the table, apart from the noble gases. Small size and seven valence electrons give it the strongest pull on a bonding pair.
Step 2: Rank them
Pauling values: F $4.0$ > O $3.5$ > N $3.0$ and Cl $3.0$. The question asks for the maximum, which is F.
Step 3: Result
Option (C), fluorine.
Final Answer:
Fluorine has the highest electronegativity.
\[ \boxed{\text{(C)}\ \text{Fluorine}} \]