The correct answer is option 1: GATT, Uruguay Rounds, Dunkel Draft, Marrakesh Treaty.

To understand why this is the correct chronological order, let`s break down each option:

- Option 1: GATT (General Agreement on Tariffs and Trade) was established first. The Uruguay Rounds of negotiations took place next, which aimed to expand GATT`s scope. The Dunkel Draft refers to the final negotiating text proposed by Arthur Dunkel, the director-general of the GATT during the Uruguay Rounds. Finally, the Marrakesh Treaty was signed, which established the World Trade Organisation (WTO) as a successor to GATT.

- Option 2: This option lists the Dunkel Draft before the Uruguay Rounds, which is incorrect. The Uruguay Rounds came before the Dunkel Draft, as mentioned earlier.

- Option 3: This option places the Uruguay Rounds before GATT, which is incorrect. GATT was established before the Uruguay Rounds.

- Option 4: This option puts the Marrakesh Treaty before the Dunkel Draft, which is incorrect. The Dunkel Draft was proposed before the Marrakesh Treaty.

Therefore, option 1 is the correct chronological order that led to the establishment of the WTO.