Final answer:
Without additional details, it's not possible to definitively choose options A, B, or C regarding the safety of the chains holding each seat. The tension in the chains is a critical factor for safety, and if it exceeds 700 N, there is a safety risk.
Step-by-step explanation:
Considering the information presented, to determine whether the chains holding each seat are secure, one must know the tension experienced by the chains under various conditions. For example, when a car is being pulled out of mud using a chain, the tension in the chain increases as the chain is tightened and attempted to be kept straight, per the information given. Similarly, if we are discussing a swing ride at a carnival, we would need to consider the forces involved while the ride is in motion, such as the centrifugal force that adds to the tension in the chains when the seats are swinging outward. Without additional context or numerical values (such as the weight of the passengers and the speed of the ride), it is not possible to provide a definitive answer to whether the situation described is option A, B, or C from the choices provided.
In general, if the tension in the chains exceeds 700 N, which is the maximum tension they can withstand, this would indeed pose a potential safety risk, making option B a valid concern. Should the tension be at the maximum limit, regular inspection would be prudent to maintain safety, which aligns with option C. Option D, stating that the maximum tension limit is not relevant to the safety of the seats, is not correct as it is an essential factor in ensuring the chains do not fail.