Releasing the accelerator is correct. The statutory speed limit inside an erf is strictly 15 km/h. Because your speedometer displays 20 km/h and children are playing nearby, easing off the accelerator brings your speed below the legal 15 km/h limit while maintaining readiness to stop immediately (Article 45, RVV 1990). Why other options are incorrect: • Brake: Braking forcefully is excessive here because the hazard is still latent and not yet directly obstructing your path. Harsh braking needlessly risks causing a rear-end collision with following traffic. • Do nothing: Doing nothing is too passive and fails to prepare you for the developing risk ahead. You must release the accelerator to reduce stopping distance and hover your foot over the brake pedal.

Official CBR Exam Tip: In the Dutch category B driving theory examination, testing focuses on road insight and statutory priority under RVV 1990 and WVW 1994. Always inspect road markings, anticipate turning maneuvers, and accord pedestrians and cyclists their required legal precedence.