The correct answer to this is B. Guardrails.
Guardrails are put in place in the home and out in public spaces to prevent falls, that is their sole purpose. An anchor would prevent anyone from moving at all, personal fall arrest systems are put in place to assist people after they have fallen and safety nets catch people once they have fallen also.
Answer:
B)the ventricles are contracting and pushing blood out of the heart to the lungs and body
