" I thought I 'd make sure you were feeling all right . " Sanzo 's eyes narrowed in a frown . Hakkai 's brow furrowed slightly as he continued , watching Sanzo intently .
According to the above context, choose the best option to answer the following question.
Question: What is the reason for Sanzo 's eyes narrowing ?
Options:
A. None of the above choices .
B. His brow was sweaty .
C. He was trying to focus his eyes better .
D. Sanzo was dubious about hakkai 's intent .


D