Which of the following is an indirect effect of aerosols on climate?

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Aerosols can influence climate indirectly by altering cloud properties. When aerosols act as cloud condensation nuclei, they increase the number of cloud droplets and tend to make those droplets smaller. This changes how clouds reflect sunlight (cloud albedo) and can also affect the life of the cloud, potentially delaying precipitation and making clouds last longer. In other words, the climate impact comes from the way clouds behave, not from aerosols directly scattering or absorbing sunlight. The other described effects involve direct interactions with radiation—sulfates mainly reflect sunlight, black carbon absorbs it and warms surfaces—and one option that claims no effect at all, none of which capture the cloud-mediated pathway.