8. David can choose to study in one of three streams in Form 4. His order of preference is shown below: (HKCEE : 1998.1) First preference : Arts stream (XFIFE) Second preference : Business stream (PGFF)E) Third preference : Science stream (FIF( FI) Suppose the business stream is now not offered (THEZ) in David's school. Explain how David's opportunity cost of choosing the Arts stream would change. (3 marks) (please read WSla P.8-9 for reference.) would be te