Final answer:
A JHSC composition must include equal representation of employees and employers as per the OHSA, promoting a balanced approach to workplace health and safety.
Step-by-step explanation:
The composition of a Joint Health and Safety Committee (JHSC) as mandated by the Occupational Health and Safety Act (OHSA) is A) Equal representation of employees and employers. This means that the committee should be constituted with members from both the employee and employer sides of a workplace, maintaining a balance in representation. It ensures that both parties are involved in identifying potential health and safety issues and contributes to the formulation and implementation of solutions. The JHSC plays a critical role in fostering a safe work environment by facilitating communication between employees and management regarding workplace safety.