A$.$ All options:

While there might be some general accounting relationships between these ratios, not all options are necessarily true. For example, a below$-$historical ratio doesn't always indicate undervaluation, and the assumption isn't inherent in every valuation model.

C$.$ when the current price ratio is below the historical ratio:

While a lower current ratio than historical ratios can suggest undervaluation, this isn't always the case. Other factors need to be considered, and the assumption is not universal.

D$.$ there is some general accounting relationship between these five ratios:

While there might be some interconnectedness in a company's financials, the core assumption of these valuation models is about the historical relationship between ratios and price, not necessarily direct accounting relationships between the ratios themselves.$$