Explanation:

Let's break down the sequence of events:

- 1) Siraj-ud-Daulah invaded the British factory at Kasimbazar – This was the trigger event; he attacked the British factory first.

- 2) Black Hole Tragedy – After taking control of Calcutta, British prisoners were put in a small cell, leading to the infamous tragedy.

- 4) Treaty of Alinagar – The British recaptured Calcutta, and the treaty was signed between Siraj-ud-Daulah and the British.

- 3) Battle of Plassey – This was the decisive battle after the above events.

Chronological sequence:

First (1), then (2), then (4), and finally (3).

So, the correct order is: 1, 2, 4, 3

Matching with options:

- Option 2: 1, 2, 4, 3

Explanation of incorrect options:

- Option 1 lists the same correct order, but options start at 1.

- Option 3 & 4 start with 3, but that would mean the Battle of Plassey happened first which is historically incorrect, as it's the final event.

Summary:

- The correct sequence is: Siraj-ud-Daulah’s invasion ? Black Hole Tragedy ? Treaty of Alinagar ? Battle of Plassey.

- Option 2 (1, 2, 4, 3) is right.