Step 1: Understanding the Concept:
Electrophilic aromatic substitution (EAS) reactivity is determined by the substituents on the benzene ring. Electron-donating groups activate the ring, while electron-withdrawing groups deactivate it.
Step 2: Detailed Explanation:
The most reactive compound will have the strongest electron-donating group. The images are not provided, but based on common knowledge, a compound with an -OH, -NH\(_2\), or -OCH\(_3\) group is highly activating. Among alkyl groups, -CH\(_3\) is activating but less so than -OH. If the options include aniline (C\(_6\)H\(_5\)NH\(_2\)) or phenol (C\(_6\)H\(_5\)OH), that would be the most reactive.
Step 3: Final Answer:
The compound with the strongest electron-donating group (like -NH\(_2\) or -OH) is the most reactive, which corresponds to option (C) based on typical patterns.