Which word is correctly used in the sentence?

a five minute walk from here to there.

it's
its

The correct answer is:  [A]:  " It's " .

(the choice with the apostrophe).

  "  It's  a five minute walk from here to there."

Note:  The word, "it's",  {note: with the apostrophe};  is a contraction for "it is" or "it has".  In this case, it stands for  it is ".  When you need to use "it is" or "it has",  you either:  1) write out the "it is" or "it has" ; or, 2) write "it's" (that is, with the apostrophe).