Final answer:
The passage is an example of a Complicating Incident, which signals the start of the rising action and introduces the main conflict of the story.
The correct answer is 5).
Step-by-step explanation:
The plot element reflected in the passage 'Maître Hauchecorne, said he, this morning on the Benzeville road, you were seen picking up the pocketbook lost by Maître Houlbreque, of Manneville.' is the Complicating Incident, because it introduces the central conflict that the main character will face throughout the story.
This passage indicates the beginning of the rising action, where the tension regarding the main conflict starts building up. It is not the exposition because it does not merely set the scene but rather introduces a specific event that triggers the conflict.