Which of the following is a tragedy by William Shakespeare?

A little clarity goes a long way.

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  A (Macbeth):

  Macbeth follows ambition, murder and the downfall of its central character; it is one of Shakespeare’s major tragedies.
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  B (As You Like It):

  As You Like It is a pastoral comedy, not a tragedy.
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  C (Twelfth Night):

  Twelfth Night is a romantic comedy involving mistaken identity, not a tragedy.
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  D (A Midsummer Night’s Dream):

  A Midsummer Night’s Dream is a comedy featuring lovers and fairies, not a tragedy.