The Graph Shows Records of Temperature (Light Gray Line) and CO₂

The graph shows records of temperature (light gray line) and CO₂ (dark gray line) over the past 1,000 years. CO₂ is recorded in parts per million (ppm) .
-If the trends shown in the graph continue, how might this affect photosynthesis?

A) Photorespiration may increase, leading to an increase in photosynthetic production of sugar.
B) Photorespiration may increase, leading to a decrease in photosynthetic production of sugar.
C) C₄ and CAM plants would be unable to photosynthesize.
D) There would be no effect on photorespiration, since CO₂ and temperature are stable.