What Does It Mean to Say That People Make Marginal

Multiple Choice

What does it mean to say that people make marginal decisions?  

A)  that people usually wait until the last minute before they make a decision to buy 
B)  that people weigh the additional costs and additional benefits of various activities before they make a decision 
C)  that, given a choice, most people would prefer to make their own decisions concerning the things that affect their lives 
D)  that people consider the total costs and benefits of various activities before they make a purchase