单选题 Among a company's price to earnings (P/E), price to sale (P/S), and price to cash flow (P/CF) ratios, it is most accurate to state that P/E ratios are generally more stable from period to period than:

A. P/S ratios but not P/CF ratios.
B. P/CF ratios but not P/S ratios.
C. neither P/S ratios nor P/CF ratios.

【正确答案】 C

【答案解析】[解析] 与盈余相比，销售额和现金流相对较为稳定，从而使价格—销售额乘数(P/S)和价格—现金流乘数(P/CF)比市盈率(P/E)更为稳定。