The cast of hamlet had to go through a(n) before their main performance.
a. try out
b. interview
c. rehearsal
d. costume fitting

The answer to the question presented above woud be c.) rehearsal. The cast of Hamelt had to go through a rehearsal before their main performance. It is the closest answer because all the other choices are done weeks or months before the performance. 

The potatoes crop failed in Ireland and caused a great famine that killed over one million people during the 1840's.