13. It can reasonably be inferred from the passage that before the 1980s, the percentage of most categories of American manufactured products that required repair was:

Answer and Explanation

Your Answer is

Correct Answer is D

Explanation

Locate to lines 35-36, the latest maintenance data is 10 to 20%, that is to say, the maintenance rate in 1980s was greater than 20%. Item D conforms to positioning information.