Final answer:
The responsibility of the Transportation Security Administration is security screening at airports. Therefore, the correct option is D. security screening at airports.
Step-by-step explanation:
The responsibility of the Transportation Security Administration (TSA) is D. security screening at airports.
The main purpose of the TSA is to ensure the safety and security of travelers in airports. They are responsible for implementing and managing security measures to prevent any dangerous items or threats from boarding an aircraft. This includes screening passengers, their baggage, and carry-on items using technologies such as metal detectors, body scanners, and X-ray machines.