The warming trend that began in the 1970s
A) extended to the 1990s.
B) ended during the mid-1980s.
C) has extended into the twenty-first century.

Question

Quizplus · Accepted Answer

The statement "has extended into the twenty-first century" implies that the warming trend has continued beyond the 1990s, making option A incorrect. Additionally, the statement "began in the 1970s" indicates that the trend was ongoing during the mid-1980s, making option B incorrect. Therefore, the best choice is C.

The Warming Trend That Began in the 1970s