Explanation:

- Economic activities are usually divided into three main categories: business, profession, and employment.

- Business involves activities aimed at earning profits through buying, selling, producing, or providing goods/services.

- A profession refers to specialized occupations that require advanced education or training, like lawyers or doctors.

- Employment means working for someone else and earning a salary or wage.

- Occupation is a broader term and refers to any activity a person engages in to earn a livelihood. It includes business, profession, and employment.

- Vocation often means a strong feeling of suitability for a particular career or occupation, but it's not a specific category of economic activity.

- Work is a general concept, not a specific classification.

The correct answer is:

Option:2, occupation