Such a scene attracts the onlookers.

The correct answer is A. instigate.

To instigate means to provoke or stir up (something, especially trouble or violence). In this case, the scene is attracting the onlookers, which means that it is causing them to be curious or interested. This is likely because the scene is unusual or exciting in some way.

The other options are incorrect because they do not accurately describe the relationship between the scene and the onlookers.

• To annoy means to irritate or bother someone. In this case, the scene is not likely to be irritating or bothering the onlookers, as it is likely to be something that they are interested in seeing.
• To repel means to cause someone to feel disgust or aversion. In this case, the scene is not likely to be disgusting or repulsive to the onlookers, as it is likely to be something that they are interested in seeing.
• To revolt means to cause someone to feel great disgust or outrage. In this case, the scene is not likely to be disgusting or outrageous to the onlookers, as it is likely to be something that they are interested in seeing.