Sentences of a paragraph are given below. While the first and the last sentences (S1 and S6) are in the correct order, the sentences in between are jumbled up. Arrange the sentences in the correct order to form a meaningful and coherent paragraph.  S1. Value-based decision-making is pervasive in nature.  
A. Examples include basic animal behaviours such as bee foraging, and complicated human decisions such as trading in the stock market.  
B. It occurs whenever an organism makes a choice from several alternatives based on the subjective value.  
C. It studies the computations that the brain makes in order to make value-based decisions.  
D. This behaviour is known as neuroeconomics, which is a relatively new discipline.   S6. The field brings together models, tools, and techniques from several disciplines.