They felt guilty if they did n't ask permission .They did n't want to upset their friend 's parents .None of the above choices .They wanted to respect their friend 's home .
What may be the reason for them asking permission ?
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 .