Rose is $$150\rm cm$$ tall. Rose\textquotesingle s older brother Quentin is $$10 \rm cm$$ taller than Rose is. Rose\textquotesingle s younger brother Sam is $$4 \rm cm$$ shorter than Rose is. What is the average of the heights of Rose, Sam, and Quentin? 
选项为:A:$$148\rm cm$$  B:$$150\rm cm$$  C:$$152\rm cm$$  D:$$154\rm cm$$  请回答其中一个选项.