Discussion
Assertion (A): Accumulation mode particles dominate the population of effective condensation nuclei.
Reason (R): They are large enough to activate readily yet small enough to persist for many days.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives both halves. Particles below about 0.1 micrometre need supersaturations clouds do not reach, and particles above about a micrometre settle out or are scavenged within hours. The accumulation mode between them activates readily and has the longest atmospheric lifetime - days to a week - so it both dominates the population and is the mode transported furthest from its source.
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