题目：阅读Passage One，回答C-16到C-20五个问题。请从A、B、C、D四个选项中选出可以填入题干空白处的最佳选项。 Passage One It is often difficult for a man to be quite sure how much tax he ought 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 any relations, how much interest he receives, how much he has spent on his house during the year, and so on. All this makes it difficult to decide exactly how much the tax is. There was an artist who was always very careful to pay the proper amount. One year, after posting his check as usual, he began to wonder if he had paid enough, and after a lot of work, with a pencil and paper, he found that he had not. He thought that he owed the government something. He was just writing another check to send it to the tax collector when the postman dropped a letter into the box at the front door. Opening it, the artist was surprised to find inside it a check for five pounds from the tax collector. The official explained that too much had been paid, and that therefore the difference was now returned to the taxpayer. C-16. According to the passage, to decide the exact amount of tax to be paid is _____.
A. simple
B. easy
C. difficult
D. interesting
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