challenge: What is the title of Emanuel Lodewijk Elte's 1912 book about semiregular polytopes?
  
  A. The Regular Polytopes of the Hyperspaces
  B. The Uniform Polytopes of the Hyperspaces
  C. The Semiregular Polytopes of the Hyperspaces
  D. The Finite Polytopes of the Hyperspaces
  Answer: 