Write a question about the following article.

I spent a good part of the day with my dad today , moving stuff back to their place etc . I felt bad at some points because I was getting irritated and taking it out on him . My heart wrenched a bit when I went to touch his arm as I thanked him ( he actually spoke to an associate at Zellers not once but TWICE to find prices for me , definitely not a common occurrence from him ) .

Question:
Why may he have thanked his Dad ?
pick from the following. -- Because it was n't a comon occurrence . -- His Dad helped him a lot . -- None of the above choices . -- Because he felt bad .