What was the primary goal of the Transportation Security Administration?

The primary goal of the Transportation Security Administration (TSA) is to strengthen the security of transportation systems across various modes, including aviation, rail, and other public transport methods. Established in response to the security challenges posed by events like the September 11 attacks, the TSA focuses on safeguarding passengers and cargo against threats such as terrorism and illegal activities. By implementing rigorous security measures, screening processes, and protocols, the agency aims to ensure the safety of travelers and uphold the integrity of the transportation infrastructure. This focus on security directly aligns with the nation's efforts to protect its citizens and maintain the trust in the transportation system as a whole.

The other options do not encapsulate the primary mission of the TSA, as they involve areas outside of security concerns. Increase in freight costs, enhancement of marketing, or training of transportation workers are not the central objectives for the TSA, indicating a clear distinction between its core mission and the other aspects mentioned.