Final answer:
The correct section in the OHS Code Part 9 that addresses a worker falling 3 meters or more without guardrail protection is 142(2). It requires the use of fall protection systems.
Step-by-step explanation:
The correct section in the Occupational Health and Safety (OHS) Code Part 9 that addresses the situation of a worker falling 3 meters or more without protection by guardrails is option C) 142(2).
This section of the code deals specifically with the requirement for fall protection systems when there is a risk of falling 3 meters or more. It states that when workers are at a height of 3 meters or more and there are no guardrails, a fall protection system such as safety harnesses or safety nets must be provided to prevent falls.
By following this section of the code, employers can ensure the safety of workers working at heights and reduce the risk of serious injuries or fatalities due to falls.