" 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 .

Based on the preceding passage, choose your answer for question Why would Sanzo frown in response to Hakkai making sure he felt all right ?
Select from the following.
(a). Hokkai may have thought it 's none of Sanzo 's business .;
(b). Sanzo may have watched none of Hokkai 's business .;
(c). Sanzo may have thought it 's none of Hokkai 's business .;
(d). None of the above choices .;
The answer is:
(c).