One of My Employees Works Harder and Logs More Overtime

Multiple Choice

One of my employees works harder and logs more overtime and consistently works weekends when needed compared with any of the other staff in our department. If I choose to promote her instead of her coworkers based on her hard work, I am using which principle of distributive justice?

A) According to individual need
B) According to societal contribution
C) According to personal rights
D) According to individual effort