Answer:
C he toured the area before and after the dam was built
1.a.
2.b.
3.d.
4.c. ...............
I would say this is a complex sentence. Because it has one independent clause(their more aggressive style did not pay of.) and two dependent clauses.
In this sentence, "which lasted two hours" is an adjective clause because it describes the school play by telling how long it lasted. Also, adjective clauses often start with words such as "who", "that", "which", or "when", along with others.
