Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Consider the following statements:

Assertion: It is known with a high degree of certainty that the recent warming trend is due to human activities.
Reason: The concentration of greenhouse gases has increased rapidly due to anthropogenic activities.

In the context of the statements above, which of these is true?

• A.
  A and R both are true, and R is the correct explanation for A.
• B.
  A and R both are true, and R is the NOT the correct explanation for A.
• C.
  
  A is correct, R is incorrect.
• D.
  A and R both are incorrect

Answer 1

The correct option is A

A and R both are true, and R is the correct explanation for A.
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Carbon dioxide concentrations have increased substantially since the beginning of the industrial era, rising from an annual average of 280 ppm in the late 1700s to 401 ppm as measured at Mauna Loa in 2015—a 43 percent increase. Almost all of this increase is due to human activities.