做题的时候遇到这题很是不解，发上来求各位大大解答
The author of a new textbook received a 100,000 advance from the publisher this year, 40,000 of income taxes were paid on the advance when received. The textbook will not be finished until next year. determine the tax basis of the advance at the end of this year.
A.0
B.40,000
C.100,000

答案是A，先谢谢各位