Correct Answer: could

Solution : The correct answer is option 2.

He tried to manage the fight but he could not.

Explanation:

The ability, possibility, and probability of a subject performing an action are represented by modal verbs, which are helping verbs that are used in conjunction with the main verb to emphasize the necessity of an action.

Could refers to a subject's capacity to carry out an action or to a promise made by the subject to carry out an action.

Whereas ,

Can is used to indicate a subject's capacity to carry out an action or to ask for authorization to do so.

May is used to indicate the likelihood that an action will occur or to request authorization to carry out an action.

Might is used to indicate the likelihood of an action occurring or to make recommendations.