While in Southern California they donned their mouse ears for the day, they bought some balloons from a vendor while they were where?\nOptions:\n- mouse trap\n- sky\n- disneyland\n- filled with air\n- fairgrounds
Think hard. Detailed solution:
disneyland
Disneyland is a theme park with various kind of stores.

Stores are places where vendors sell items like balloons.

.

So, the answer is disneyland