Explanation:

- Let's start by identifying the main context: a school event aimed at fundraising.

- Sentence D introduces the event. It mentions the school and the musical night: "The school Cultural Society organised a musical night last week."

- Sentence A explains the purpose: "The event was held to raise funds for the slum adopted by the school."

- Sentence C follows as it describes the success: "The contributions from the parents and teachers were amazing."

- Sentence B concludes with the Principal's acknowledgment: "The Principal thanked everyone for the contributions which would help in the development activities."

The correct order is DACB:

- D: Introduces the event.

- A: Explains the purpose.

- C: Highlights the contributions.

- B: Provides closure with thanks and purpose.

Correct option: 4. DACB.

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