Correct Answer: Interest

Solution : The third option is the correct choice.

Apathy refers to a lack of interest, enthusiasm, or concern.
Interest , on the other hand, implies a state of being engaged, enthusiastic, or concerned about something.

The meanings of the other options are as follows:

• Interruption: It is a break in continuity or a temporary cessation of an activity.
• Ignorance: It denotes a lack of knowledge, understanding, or awareness about a particular subject or fact.
• Sincerity: It denotes the quality of being honest, genuine, and free from deceit or hypocrisy; the state of being sincere.

Therefore, the correct antonym is i nterest .