Cuando viajo, me gusta visitar todas las atracciones a. agitadas b. cortas c. turísticas d. libres

If you travel to another country for tourism you are a visitor or tourist. Generally tourists like to visit as many touristic places as possible.

So, the right option is C, turísticas (tourist) and the complete sentence is:

When I travel, I like to visit all the tourist attractions.

The options agitadas (hetic areas), cortas (short) and libres (free areas) are not correct because are not in the context of what a tourist generally does.