(17) Ed’s space walk on June 3, 1965, was a triumph. (18) His next mission would be on board of the Apollo 1. (19) He was promoted to the position of Senior Pilot. (20) This mission did not make it into space. (21) During a test on the launch pad, the command module caught fire, and Ed and two other astronauts died. What is the most effective way to combine sentences 18 and 19?

A. He was promoted to the position of Senior Pilot for this next mission on Apollo 1.

B. He was appointed to Senior Pilot for his next mission; Apollo 1 was his next mission.

C. After being appointed to the position of Senior Pilot; Ed, was ready for a mission.

D. Apollo 1 was to be his net mission where he was the Senior Pilot, the oldest of all the other astronauts on the mission.