Triple

Target class: booster stage
Context triple: [Universal Rocket Module URM-1, instanceOf, booster stage]

• A. rocket booster chosen
  A rocket booster is a powerful propulsion component that provides the initial thrust needed to lift a launch vehicle off the ground and accelerate it through the early stages of flight.
• B. thrust stage
  A thrust stage is a performance platform that extends into the audience on three sides, allowing closer actor–audience interaction while retaining a backstage area at the rear.
• C. rocket upper stage
  A rocket upper stage is the final propulsion segment of a launch vehicle, designed to operate in near-vacuum conditions to place payloads into their intended orbits or trajectories after lower stages have completed initial ascent.
• D. expendable launch vehicle stage
  An expendable launch vehicle stage is a non-reusable rocket segment that houses propulsion, propellant, and associated systems, designed to operate for a specific phase of flight and then be discarded once its fuel is depleted.
• E. prototype rocket stage
  A prototype rocket stage is an experimental segment of a launch vehicle, typically containing structure, propulsion, and control systems, built and tested to validate design concepts and performance before full-scale production.
• F. None of above.