Which of the Following Is Correct Regarding Health and Safety

Which of the following is correct regarding health and safety issues and collective agreements:

A) health and safety committees are required when provided for in the collective agreement
B) health and safety legislation requires that collective agreements contain provisions providing for a health and safety committee
C) many collective agreements provide for specific health and safety provisions instead of relying on the provisions found in legislation
D) employees have the right to refuse unsafe work if this right is provided in the agreement
E) the collective agreement must provide for a health and safety committee composed of members as provided in health and safety legislation