A.I. Explanation:

Option 1: "Food stalls offering international cuisine"

Explanation: This option is incorrect because the text states that food stalls offering both traditional and international cuisine have been a part of the festival, indicating that this is not a new feature. The presence of international cuisine is not mentioned as a new addition for this year.

Option 2: "Live music from local bands"

Explanation: This option is incorrect as the text mentions live music from local bands as a feature of the festival, but it does not specify that this is a new addition for this year. Therefore, it cannot be considered a new feature.

Option 3: "Children's activities"

Explanation: This option is incorrect because the text refers to children's activities being abundant at the festival, but it does not indicate that these activities are new. They have been part of the festival in previous years.

Option 4: "A guided 'Heritage Walk'"

Explanation: This option is correct as the text explicitly states that for the first time, the festival will include a 'Heritage Walk,' which is a new feature highlighting Oakwood's historic districts. This aligns with the question about what new feature is being introduced this year.