Which of the following sentences is correctly written?
A. Mike wanted to get home, before the ice storm that was forecasted for the immediate area hit.
B.Before the race was over Pierre got a sudden burst of energy that propelled him to the finish line.
C. As I have said before, painting the inside of the entire office building will take more than one week.
D. Eduardo climbed some peaks in the Himalayan mountain range, when he was studying to become a guide.