Common carriers are not liable for losses resulting from which of the following causes of loss?

Common carriers, such as freight and passenger transport services, have a unique liability structure due to the nature of their business. They are generally held to a high standard and are responsible for the safe transportation of goods and passengers. However, certain events known as "Acts of God" or natural disasters, such as floods, earthquakes, and severe weather conditions, are typically exceptions to this rule.

These Acts of God are unexpected and unavoidable occurrences that can disrupt transportation and lead to losses or damages for which the carrier is not held responsible. Since these events are outside the control of the carrier and cannot be anticipated, the law recognizes that it would be unreasonable to hold them liable in such circumstances.

In contrast, situations such as truck breakdowns, unsafe roads, and unavoidable perils typically fall within the responsibility of the carrier unless they can clearly prove that such issues were indeed due to Acts of God. Therefore, the correct answer highlights the limitation of a carrier's liability specifically relating to uncontrollable natural events.