I believe the answer is: Darlene
Formal operational thinking is distinguished by the ability to think about an abstract concept and implement it in order to solve a certain problem. This could be shown in Darlene's method of teaching which seems to be based on a concept that students are much more likely to understand the subject if the teacher directly involved in the process.
Answer:
A bicameral parliament is one that contains two separate assemblies who must both agree when new laws are made.
Comitatus .. . . . . . . . . . ... . . .