Sam is a risk$-$averse investor. John is a less risk$-$averse investor than Sam. Therefore, O a$.$ for the same return, Sam tolerates higher risk than John, O b$.$ for the same retum. John tolerates higher risk than Sam.O c$.$ for the same risk, Jorin requires a higher rate of return than Sam. d$.$ for the same risk, Sam requires a lower rate of return than John.