Find the mistake: Of the most important machines (A) invented in the late nineteenth century, no machine (B) had a (C) g

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions

Question:

Find the mistake: Of the most important machines (A) invented in the late nineteenth century, no machine (REMOVE) had a (OLD) great impact (EASY) on the USA’s economy than the automobile.

• 
  A.
  invented
• 
  B.
  had
• 
  C.
  great
• 
  D.
  on