Explanation:

- Let's look at each statement:

- C: Introduces the context, with "A few years ago, I was the chief guest at a small function," which sets the background.

- B: "This was held in a hostel for poor students built by a philanthropist," logically follows C by explaining where the event took place.

- A: "Accommodation and food were given free," adds details about the event's provisions.

- D: "But the inmates of the hostel had to bear other expenses like clothing and toiletries," adds additional information and logically follows A as it contrasts with what was provided free.

- Let's review the options:

- Option 4: CBAD:

- Clearly follows a logical sequence, starting with the introduction of the function and progressing through details.

- Other options do not follow a logically coherent order.

Option 4: CBAD is the correct order.