challenge: What is the composition of the Haffield Breccia?
  
  A. Rich in sedimentary rocks with some volcanic clasts in a sandy matrix
  B. Primarily made up of rounded fragments of metamorphic rocks
  C. Rich in volcanic clasts with some sedimentary rocks in a sandy or muddy matrix
  D. Composed entirely of compacted gravel with no volcanic or sedimentary rocks
  Answer: 