All the flights ()because of the extremely heavy rain, we had to postpone our schedule.

A. Last month the U. S. economy lost fewer jobs than expected.
B. The unemployment rate fell to 4.6 percent.
C. Many Companies have been forced to change their hiring plans.
D. Federal Reserve policymakers have lowered interest rates several times this year.

A.after
B.by
C.during
D.until