Read the following context and choose the best option to answer the question.
Context: I was at a friend 's house a few days ago and I was feeling thirsty . " Is it okay if I help myself to the juice ? " I asked , peering into the fridge . " Sure , " said my friend .
Question: What may be the reason for them asking permission ?
Options: 
A. They did n't want to upset their friend 's parents .
B. They felt guilty if they did n't ask permission .
C. They wanted to be polite in another 's home .
D. None of the above choices .


C