Photorespiration accurs when:

Explanation

Photorespiration occurs when Rubisco, an enzyme involved in photosynthesis, binds with O2 instead of CO2. This process is more likely when the concentration of O2 inside the leaf is high, which happens when stomata are closed to prevent water loss in hot and dry climates. Consequently, CO2 levels drop, and O2 levels rise, increasing the likelihood of photorespiration. Thus, option D is correct. The other options are incorrect because open stomata (option A) and high CO2 levels (option C) favor photosynthesis, and humid conditions (option B) typically result in open stomata, reducing the chance of photorespiration.