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. It was the invention of the assembly line instead

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.

It was the invention of the assembly line instead than the increase in the average pay of workers that allowed automobiles to be purchased by so many in the early years of the twentieth century