The afferent arteriole in a nephron dilates. What happens to resistance in the afferent arteriole and GFR in that nephron? a) Afferent arteriole resistance increases; GFR decreases b) Afferent arteriole resistance increases; GFR increases c) Afferent arteriole resistance decreases; GFR decreases d) Afferent arteriole resistance decreases; GFR increases