Which difference in brushwork is most suitable for distinguishing distant trees from nearby trees?

Correct answer: Softer edges and less distinct texture in distant trees

The governing concept is atmospheric or aerial perspective: distance reduces apparent edge sharpness, contrast, and surface detail because intervening air softens visual information. Option B is correct, so distant trees should receive softer edges and less distinct texture, while nearby trees can have clearer marks and stronger detail. Harder distant edges or identical treatment would weaken the sense of depth, and leaving foreground trees unpainted is unrelated.