The correct statement is:
The rate of photosynthesis increases with an increase in carbon dioxide; therefore, area 1 will have a higher rate of photosynthesis compared to area 2.
In photosynthesis, carbon dioxide is one of the key reactants, and an increase in the concentration of carbon dioxide generally enhances the rate of photosynthesis, provided other conditions (like light intensity and water availability) are adequate. Since area 1 has a high amount of carbon dioxide, plants in this area are likely to photosynthesize at a higher rate than those in area 2, where the carbon dioxide levels are low.