How is the word biopsy abbreviated?

How is the word biopsy abbreviated?
 
  A) bi
  B) bp
  C) bx
  D) by

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The abbreviation R stands for
 
  A) revise.
  B) repetition.
  C) resume.
  D) respiration.

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The abbreviation HR stands for
 
  A) heart rate.
  B) heart and lungs.
  C) hourly.
  D) height and range.

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What is an abbreviation formed from the first letter in a word or phrase?
 
  A) Synonym
  B) Acronym
  C) Prefix
  D) Homonym

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Spelling medical terms correctly is very important because two words may sound the same but have
 
  A) completely different meanings.
  B) somewhat similar meanings.
  C) two different verb tenses.
  D) usage in different medical specialties.