The best answer choice that uses correct punctuation for the passage is:
When I go to the grocery store, I always make sure to buy: bananas, apples, and oranges. It's important to have a shopping list so I don't forget anything I need. I also like to avoid busy hours; you know, when everyone else is shopping.
This choice correctly punctuates the list of items and properly uses commas, semicolons, and colons. Additionally, "don't" is spelled correctly.