Correct Answer: Disperse

Solution : The correct option is the fourth option.

Explanation:
In the context of the sentence, disperse means to scatter or cause to scatter in different directions. The Indonesian police used warning shots, tear gas, and water cannons to try and scatter or break up the crowd. So, the correct option is to disperse , fitting the situation of using force to scatter or disband the crowd.
The meanings of the other options are as follows:
Discrete refers to being individually separate and distinct.
Delimit means to fix, mark, or define the boundaries or limits of something.
Deleterious means causing harm or damage.

Therefore, the complete sentence would be: "Indonesian police fired warning shots, tear gas, and water cannon to try and disperse the crowd."