Rearrange the following sentences in correct order to make a logical passage:
1. A communication strategy was developed using outreach insights.
2. Demographic data was monitored through campaign dashboards.
3. User engagement was gathered from multiple platforms.
4. Analysts classified users according to age and behaviour.

The correct option is 3-2-4-1.

Let us analyze the logical flow and chronological sequence of the given sentences step-by-step to form a coherent passage:

1. Initial Data Collection (Sentence 3): "User engagement was gathered from multiple platforms."
The process begins with the broad collection of raw engagement data from various platforms.

2. Monitoring and Tracking (Sentence 2): "Demographic data was monitored through campaign dashboards."
Once the engagement data is gathered, the incoming demographic data is actively monitored and tracked using campaign dashboards.

3. Data Classification and Analysis (Sentence 4): "Analysts classified users according to age and behaviour."
After monitoring the demographic data, analysts process and categorize the users based on specific parameters such as age and behavior.

4. Strategy Formulation (Sentence 1): "A communication strategy was developed using outreach insights."
Finally, based on the insights gained from analyzing user demographics and behavior, a targeted communication strategy is developed.

Therefore, the logical and chronological order of the sentences is 3 → 2 → 4 → 1.