Explanation:

- Option 1: Patriotism

- Patriotism is a feeling of devotion or love for one’s country.

- It’s a non-economic activity as it doesn’t result in financial gain or economic output.

- Option 2: Teaching

- Teaching can be both an economic and non-economic activity.

- When performed professionally for a salary, it’s an economic activity.

- Therefore, it's an example that can be considered economic.

- Option 3: Sentiment

- Sentiments are emotional feelings or opinions.

- These do not involve monetary transactions, making it a non-economic activity.

- Option 4: Sympathy

- Sympathy involves feelings of compassion towards others.

- It doesn’t involve economic exchange and is a non-economic activity.

- Correct Option:

- Option 2: Teaching is not a non-economic activity.