Preposition choice after an evaluative adjective: "unreasonable ____ him to …" Complete the sentence with the correct preposition: "It was indeed unreasonable ______ him to leave this job and start business." Choose the correct option.

Given data

• Construction: adjective of personal judgement + pronoun + infinitive.

Concept/Approach
With adjectives expressing judgement of a person's action (e.g., "kind", "foolish", "unreasonable"), English uses the pattern "adjective + of + person + to + verb": "It was unreasonable of him to leave."

Option analysis
of — correct: "unreasonable of him to …." ✅for — used when the adjective describes the situation, not the person (e.g., "It is unusual for him to …").to / from — wrong prepositions for this structure.

Final Answer
of