I arrived at school , thinking it was a beautiful day . When I entered the classroom I say everybody studying for a test , a History test , I apparently had forgotten . I did not study for the test because when I got home the day before I had my Chinesse class and this time it was more dynamical and entertaining . One period before the test our good friend Maria explained both Revolutions to us , I think I did good despite the incident .

Question: What might I have done after the test since Maria helped me ?
Answer: I might not have thanked Maria but promised to pay back the favor .I might have thanked Maria but did n't promise to pay back the favor .I might not have thanked Maria and did n't promise to pay back the favor .I might have thanked Maria and promised to pay back the favor .