单项选择题

According to the passage, which of the following is NOT a factor in the complete understanding of price

A．The quality of a product.
B．Warranties that cover a product.
C．The quantity of a product.
D．Instructions that come with a product.
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单项选择题
is the last sentence, the word they refers to ______.
A．cash and credits
B．buyers and sellers
C．return privileges
D．all the factors
单项选择题
What is the best title for the passage
A．The Inherent Weaknesses of the Price System.
B．Credit Terms in Transactions.
C．Resource Allocation and the Public Sector.
D．The Complexities of the Price System.
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