You are given a paragraph (Passage), a question (Question) and two answer options (Option1 and Option2). Your task is to find the correct answer (and return the string of the correct option, not option1/2) for the given question from the given options and based on the given passage. Answer of the question can be found directly from the passage.
One example: Passage: Omelettes make a great breakfast , and I enjoy making them because they are very easy to cook . First , I get the eggs out and begin cracking them on the side of the bowl and dumping them into the bowl . I normally use two eggs whites and one whole egg to cut the calories . I add some salt and pepper to the mix for flavor . I pour the mixture into the hot frying pan . I make sure that I add some vegetable oil to the pan before I add the eggs though because I do n't want them to stick . As this occurs , I add some cheese or vegetable to the center of the egg mixture . Really , almost any type of cheese or vegetable makes a good omelette . I then flip one side of the omelette over on to itself to seal in the contents in the middle . It is then ready to serve ! Question: How many times is the omelette flipped? Option1: three times Option2: once
Solution is here: once
Explanation: As mentioned in the passage that I then flip one side of the omelette; it is clear that omelette is flipped one time only.

Now, solve this: Passage: Yesterday I boiled milk for my mom . Whenever she goes to work she asks me to do tasks for her so that when she comes home she does n't have to do it . Yesterday she wanted me to walk across the street to the store and buy some milk . My mom left me instructions how to boil the milk for her . I got a big pan and put it on the oven . I turned on the oven and made the pan hot by turning the dial to high . After a while the milk started to get hot , which I could see because it would move and I saw steam . When bubbles started appearing in the milk , I knew it was boiled and done . Question: When did the walk happen? Option1: before reaching the store Option2: After she boiled the milk
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
before reaching the store