Which statement is most correct about the Security Market Line (SML)（）

A. The SML is a theoretical, long run relationship and therefore never changes.
B. The SML will get a steeper slope if inflation is expected to decrease, reflecting the fact that riskier investments benefit most from reductions in inflation.
C. The SML will get a steeper slope if investors become more risk-averse, indicating that investors will demand a higher risk premium when their risk aversion increases.