Question

The........,room are upstairs.
a.childrens
b.child
c.children's
d.children

Answer 1

HEY DEAR HERE IS YOUR ANSWER
.
.
.
.
I THINK IT'S OPTION C CHILDREN'S.



HOPE IT HELPS YOU.

Answer 2

Here it should be (a).

Also the sentence could be

The children's room is upstairs.

Hope it helps