What does Lulu do on Sundays?

Brief Explanation:

Step-by-step Solution:

1. Step 1: Locate the 'SUN' (Sunday) column.
2. Step 2: In the 'drink milk' row, a checkmark is present, indicating she drinks milk.
3. Step 3: In the 'play tennis' row, there is no checkmark.
4. Step 4: In the 'watch cartoons' row, a checkmark is present, indicating she watches cartoons.
5. Step 5: In the 'eat vegetables' row, a checkmark is present, indicating she eats vegetables.
6. Step 6: In the 'read a story' row, there is no checkmark.

Answer: Lulu drinks milk, watches cartoons, and eats vegetables on Sundays.