And the good amount of time to walk? About 45 to 60 minutes would be good. If you aren’t used to walking that much, start with whatever you are comfortable with, then add an extra 5 minutes of walking each day. Based on the context, what is the given information, A, B, C, or D?（ ）。
选项：

A:the good amount of time
B:minutes
C:walking
D:comfortable