First-time computer buyers buying PXC home computers typically buy models that cost much less and have a smaller profit margin per computer than do PXC computers bought by people replacing their computers with more powerful models.  Last year PXC's profits from computer sales were substantially higher than the previous year, although about the same number of PXC computers were sold and the prices and profit margins for each computer model that PXC sells remained unchanged.

If the statements above are true, which of the following is most strongly supported by them?

(A) PXC's competitors raised the prices on their computers last year, making PXC computers more attractive to first-time computer buyers.

(B) The number of people buying PXC computers who also bought PXC computer-related products, such as printers, was larger last year than the previous year.

(C) Among computer buyers who bought a PXC computer to replace their existing computer, the proportion who were replacing a computer made by a competitor of PXC was greater last year than the previous year.

C只讨论了买PXC替换原有computer的群体，这个群体中换掉的原机器是PXC的比例对profit

是没有贡献的。

First-time computer buyers buying PXC home computers typically buy models that

cost much less and have a smaller profit margin per computer than do PXC computers

bought by people replacing their computers with more powerful models.

请问LS MM这句话不是提到：换机器而买PXC的利润么？还是偶的理解有问题？。。。