请教一道英语题,请回答

题目

请教一道英语题,请回答
-Emma has been ill for a week,is she all right now?
-_____________the teacher says she can come to school tomorrow.
a/i think so
b/that is true
希望解释.

答案

a 我想是的.后面有解释
b 的表达明显就是汉语化的