Which is a compound-complex sentence?
A) After the massacre occurred, the government started an investigation, but no one expected to find anything.
B) Although it will set you back at least a thousand dollars, a trip to Las Vegas is unforgettable.
C) The funeral will be held in Chattanooga, Tennessee on Wednesday at 10:30 a.m.
D) At six o'clock in the morning, her ceiling fan crashed to the floor.