Given the task definition and input, reply with output. 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.

Passage: It had been a long time since I had heard from my grandma , and she does not understand how to use email . I tried to call her , but it was difficult for her to hear me . She would just hang up on me . I went to the local variety store and bought some supplies . I bought some stationary and some envelopes . I also bought a nice pen . I folded the letter up and I wrote her address on the envelope . I used our address as the return address . I went to the post office and waited in line . When it was my turn , I gave my envelope to the cashier . The cashier weighed it for me and asked for postage . I paid her and my letter was sent ! Question: who did he write the letter for? Option1: their grandma Option2: the cashier at the store
their grandma