What is included in the Spelljammer: Adventures in Space boxed set?

A. A single 128-page sourcebook and a set of polyhedral dice
B. Three 32-page sourcebooks and a poster map of the asteroid-city Rock of Bral
C. Three 64-page sourcebooks, a Dungeon Master's screen, and a poster map of the asteroid-city Rock of Bral
D. A single 64-page sourcebook and a Dungeon Master's screen
Answer: 