答案解释：
文中提到“For a flat with one bedroom，one dining—room，akitchen，a bathroom，thecouple will pay about$900 a month.What’s more，if they want to have a child，the child’s education is very expensive.For example，mostkindergarten charges are at least$5，000 a year.”我们可做出计算：900×12+5000=15800，故D项正确
