​Match Each of the Following Scenarios with the Concept It

​Match each of the following scenarios with the concept it most clearly illustrates.
-informal leader

A) ​Dave doesn't usually get along with the other members of his marketing team, but when a huge deadline is unexpectedly pulled forward by one week, the team comes together, supports each other, and works together to get the project done.The experience brings them closer.
B) Sarah knows that because her team has a lot of high achievers, she doesn't have to volunteer for any of the extra tasks her team is assigned -- somebody else will get them done.
C) Dina is a math teacher.Although she is technically "just another teacher," the respect that she commands from the other teachers usually means that projects won't go through without her approval.