A.I. Explanation:

Option 1: "A variety of food stalls"

Explanation: While the text mentions that attendees can enjoy a variety of food stalls, this feature is not new to this year's festival. The phrase 'this year' indicates that the question is specifically asking for something that is being introduced for the first time, which food stalls do not represent.

Option 2: "Interactive art installations"

Explanation: The text states that there will be interactive art installations at the festival, but it does not specify that this is a new feature. Therefore, this option does not answer the question about what is being introduced this year.

Option 3: "A silent disco area"

Explanation: The text explicitly states that this year, the festival will introduce a 'silent disco' area, which is a new feature. This aligns perfectly with the question asking for something new at this year's festival, making it the correct answer.

Option 4: "A diverse line-up of performers"

Explanation: The mention of a diverse line-up of bands and solo artists is part of the festival's ongoing offerings and does not indicate a new feature for this year. Thus, it does not satisfy the requirement of the question regarding new introductions.