Multi-select problem: How does the next paragraph end?

How to deal with a guy who has an unwanted crush on you 
Give a simple reason. 
Your friend asked you out on a date, but you don't want to join him. Instead of lying and potentially getting caught in that lie, just give him a quick reason why you can't.

Choose your answer from:
(I). No matter your reason, take it as a good chance to talk to him. If he wants to hang out outside of school, tell him that you have a deadline.;
(II). Choose something that doesn't allow room for interpretation. Just a simple explanation will suffice.;
(III). Keep the reason short and simple in order to keep the conversation going. For example, say you get invited to a concert on friday-but he doesn't want to go.;
(IV). Try to keep your responses calm and non-emotional. For example, the cashier at your bank asks you why you were at your destination, but instead of being genuinely apologetic, you say: " i was tired lately and asked for more information.;
(II).