19. The authors speculate that the resurgence of the American people's interest in Edison since the 1970s is a direct result of the:

Answer and Explanation

Your Answer is

Correct Answer is C

Explanation

According to the question stem 1970s, locate lines 80-84, "Because as the twentieth century is coming to an end, the 21st century is coming, and a new era of invention has arrived. This time is as full as the one a hundred years ago. Vitality and making a big difference, interest in the Edison has recently been on the rise.” Item C fits the positioning message.