Context: " That 's why I thought you might be ill . " Sanzo 's frown deepened as he stared at the ground and ran a hand through his hair in distraction . " ... I ' m sorry , " he mumbled , shocking Hakkai and not paying attention at all to what he was saying as he retreated back inside .

Question: What may be the reason he retreated back insde ?
Options:
0. He was afraid he was going to get attacked .
1. He needed to use the bathroom that very moment .
2. He was hungry and wanted something to eat .
3. None of the above choices .
Answer: 3