Final answer:
The four major systems in a rocket (structural, propulsion, guidance, payload) work together to achieve space travel and deliver payloads to orbit. Therefore the correct option is 1.
Step-by-step explanation:
The four major systems of a rocket, which include the structural system, the propulsion system, the guidance system, and the payload system, all work together for a specific overall purpose. This purpose is achieving space travel and delivering payloads to orbit. The structural system provides the frame of the rocket, the propulsion system generates the lift-off thrust, the guidance system controls the rocket's course, and the payload system carries the cargo, such as a satellite or space probe. These systems operate together to enable the rocket to overcome Earth’s gravity and travel into space.
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