The price of shirts declines dramatically. Javier now feels richer and buys more shirts than he normally would. This situation is an example of the
A) income effect
B) law of supply
C) substitution effect

I think the answer for this question is A

Which profession is most likely to be concerned with the effect of supervisors management styles? 
Each profession will have their own set of ideas and needs they want their managers to do. Effectiveness of the supervisor and management style is going to vary based on career field and the set expectations, it's hard to say which professor would be the most concerned without further information.