What would happen if the student increased the carbon dioxide available for the plants in area 2?

The plants in area 2 would photosynthesize faster than the plants in area 1.
The plants in area 2 would photosynthesize faster than the plants in area 1.

The plants in area 2 would photosynthesize slower than the plants in area 1.
The plants in area 2 would photosynthesize slower than the plants in area 1.

The plants in area 2 would stop photosynthesizing.
The plants in area 2 would stop photosynthesizing.

The plants in area 1 would stop photosynthesizing.
The plants in area 1 would stop photosynthesizing.

The plants in area 2 would photosynthesize faster than the plants in area 1.