Ms.Thayer visited our class today. Ms.Thayer is our town officer.
The 
would enable a woman to assess a man's level of commitment, detect the existence of prior commitments to other women or children, and simultaneously signal to the man her sexual fidelity.
Answer: Class stratification
Explanation: Class stratification can be defined as the division of society on the basis of access of different sections of he society on the resources available. Class stratification identifies the religious, economic or cultural difference between different sections. It is a form of social stratification.
Under such a stratification the section having higher level of income have higher level of power in the society.
