challenge: What is the origin of the designations 'Lambda Cancri A' and 'Lambda Cancri B' for the binary star system?
  
  A. They were assigned by the International Astronomical Union (IAU) independently
  B. They were derived from the Washington Multiplicity Catalog (WMC) convention, adopted by the IAU
  C. They were randomly assigned by astronomers
  D. They were chosen by the discoverer of the binary star system
  Answer: 