What is the primary purpose of the National Transportation Safety Board (NTSB)?

The National Transportation Safety Board (NTSB) primarily conducts investigations into accidents and incidents in various modes of transportation, including aviation. Its primary purpose is to ensure that thorough and independent investigations are carried out to determine the probable cause of accidents, which helps to improve safety in the transport sector.

Through its findings, the NTSB recommends changes to laws, regulations, and practices to prevent future accidents. This function is crucial as it enhances overall public safety and accountability within the transportation system. The NTSB does not engage in functions such as flight training, managing air traffic, or issuing licenses, which are handled by other regulatory bodies. Therefore, the focus on reviewing and investigating accidents is at the core of the NTSB’s mission, making it the correct answer.