It's good __you to go out __after supper every day A for;to a walk B to;to a walk; C for;for a walkD to;walks

It's good __you to go out __after supper every day A for;to a walk B to;to a walk; C for;for a walkD to;walks
It's good __you to go out __after supper every day A for;to a walk B to;to a walk; C for;for a walk
D to;walks

It's good __you to go out __after supper every day A for;to a walk B to;to a walk; C for;for a walkD to;walks
C.be good for sb.对某人有好处,go (out) for a walk 出去散步

C It is good for sb to do sth. 对某人来说做……是好的
go out for a walk 外出散步

C

第一空是for,it is ~for sb.是固定搭配
第二空是for a walk,go for a walk是固定搭配，出去散步。
希望帮到你了。选c

C for;for a walk