Your boss asks you to explain what the purpose of Google’s ranking and indexing algorithms are. How do you best explain this?

Your boss asks you to explain what the purpose of Google’s ranking and indexing algorithms are. How do you best explain this?
  A)  They’re designed to deliver results in the least amount of time possible
  B)  They crawl the Internet and know about each and every page – and what the page’s topic is.
  C)  They’re designed to deliver the best results to people.
  D)  They are made up of over 2000 different ranking factors that the marketing world knows and understands.