After reading the paragraph below, answer the questions that follow.

The graph shows records of temperature (light gray line) and CO
2 (dark gray line) over the past 1,000 years. CO
2 is recorded in parts per million (ppm).
If you focus on the data from the mid-1900s (indicated by the arrow) through today, the graph shows that
◦ there is a correlation between CO
2 and temperature; when CO
2 levels are high, so is temperature.
◦ there is no correlation between CO
2 and temperature; CO
2 fluctuates randomly and temperature is constant.
◦ there is no correlation between CO
2 and temperature; CO
2 is constant and temperature fluctuates randomly.
◦ there is a correlation between CO
2 and temperature; when CO
2 levels are high, temperature is low.