I’m considering c or d but what is the answer

Astairway has 6 steps. is it a handrail required? a. a handrail is required b. a handrail is not required c. double handrails are required d. only nosing is required

Anti-smoking ads are an example of a) the influence of friends b) the influence of family c) the influence of media d) the influence of teachers

Stress at moderate levels that produces positive results is