Final answer:
The aspect of climate change involving cloud cover is an example of a positive feedback loop, where a decrease in cloud cover results in an increase in temperature and an eventual increase in cloud cover.
Step-by-step explanation:
The correct answer is b. Decrease in cloud cover → Increase in temperature → Increase in cloud cover. This is an example of a positive feedback loop involving cloud cover and temperature. When there is a decrease in cloud cover, it allows more sunlight to reach the Earth's surface, resulting in an increase in temperature. The increase in temperature then leads to an increase in evaporation, which can lead to more cloud formation and an eventual increase in cloud cover.