Which of the following statements is correct? ( )
选项：

A:A trailing P/E can be high because current earnings are temporarily low, even though expected future growth would indicate that the P/E should otherwise be low.
B:A normal P/E implies that residual earnings are expected to continue at the current level (and, equivalently, earnings are expected to grow, cum-dividend, at the required rate of return).
C:A firm with a high P/E and a low P/B is one where residual earnings are expected to increase from their current level but are expected to be lower than zero
D:Temporarily high earnings are expected to decline, so should have a high P/E ratio.