Answer: OB. The couple has at least one child living at home.
They were excited about the school nearby and the toys in the yards, indicating they must have a child with them.
OC. The husband has a long commute to work.
It is mentioned in the text the husband's workplace is farther from the new place, and he wanted to know the route to his office, which indicates the above.
There is no hint in the text of the realtor getting tired of showing them houses.
Also, The couple seems very happy with the new place, and they show no evidence that they want to go back to Cleveland.