题目内容：
阅读文章，回答题：It is often difficult for a man to be quite sure. what tax heought to pay to the government because it depends on so many different things:whether the man is married; how many children he has; whether he supports anyrelations; how much he earns; how much interest he receives; how much he hasspent on his house during the year, and so on and so forth. All this makes itdifficult to decide exactly how much the tax is.
There was a certain artist who was always very careful to pay theproper amount.
One year, after posting his check as usual, h'e began to wonder ifhe had paid enough, and after a lot of work, with a pencil and paper, hedecided that he had not. He believed that he owed the government something.
He was just writinganother check to send to the tax-collector when the postman dropped a letterinto the box at the front door. Opening it, the artist was surprised to findinside it a check for five pounds from the tax-collector. The officialexplained that too much had been paid, and that therefore the difference wasnow returned to the taxpayer.
It is mentioned in the passage that one has to pay taxaccording to A．how much education one has received
B．whether one is single or married
C．how old one's children are
D．where one lives
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