What does participation of bazaaris clergy and youth in the Iranian Revolution show?

Correct answer: Opposition had become a broad social coalition

The direct answer is A: opposition had become a broad social coalition. A social coalition means that several different groups join around a common complaint or aim. In Iran, bazaaris were traditional merchants, clergy were religious leaders, and young people represented an important part of society. Their participation shows that opposition to the ruling system was not limited to one profession, one class, or the army. Step by step: first, different groups experienced or perceived problems; second, they expressed dissatisfaction; third, their combined protests made the movement wider and stronger. Option A is correct because it describes this broad alliance. Option B is wrong because the revolution was not carried out only by soldiers. Option C is the opposite of the evidence, because many social groups participated. Option D is wrong because the revolution was an internal mass movement, not merely a foreign invasion. Remember: participation by merchants, clergy, and youth is a clue for a multi-group or broad-based movement.