What type of sentence is this, and what kind of punctuation does it need?
before you put the car in drive, make sure you buckle your seat belt
     
      A.     Declarative – period (.) 
      B.     Interrogative – question mark (?)
      C.     Exclamatory – exclamation point (!)
      D.     Imperative – period / exclamation point (. / !)
      E.     None of the above