Dahlia is trying to make partner at one of the city's most prestigious law firms. It is generally understood that associates remain hard at work in the office until at least 7 or 8 o'clock each evening. This is an element of the firm's group:

Norms  

Explanation:

 According to the given scenario, Dahlia is trying to make a connection or we can say that partner at one of the famous law firms and in every organization or firms it is understood that the employees are working in the office at least 7 or 8 o' clock each evening so this is one of the firm's social norm.

 The firm's norms is the term which is used to describe about the basic rules, laws, culture and regulation of the company which is follow by each member or employee in the firm.

The main objective of the organizational norms is to maintain the discipline and the equality among each employee in the firm. Therefore, Norms is the correct answer.