Please assist me

Dear All,
   
  Could you please help me to choose the right prepotition as following 
question:
   
  The gate isn't made........ iron, it's made ......... wood and rope
  a. of / of                   c. of/ from
  b. by/ from               d. from/ in
   
  Which is the right answer?
   
  Thanking in advance
  alec dhay
   

                
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