To identify the odd one out in each line:

1. **A. Africa** - odd one out; the other options are continents or countries.
2. **A. Asia** - odd one out; same reasoning as above.
3. **A. tower** - odd one out; the others are related to shapes or concepts.
4. **A. market** - odd one out; the others are abstract nouns.
5. **A. tower** - same as #3.
6. **A. small** - odd one out; the others are geographic names.
7. **A. America** - odd one out; the others are mapped territories.
8. **A. crowded** - odd one out; the others refer to food or taste.
9. **A. remember** - odd one out; the others refer to holidays/events.
10. **A. competitive** - odd one out; the others are types of food or meals.

Each odd one out is defined by either its category or relationship to the other items in each list.