Answer: D. The heavier weight of the MSL made airbag landing technology impractical.
Explanation:
Airbags have been used by NASA before to land objects on Mars such as during the Pathfinder and Spirit and Opportunity missions due to their practicality in landing in a planet like Mars with its thin atmosphere.
This however could not be used for the Mars Science Laboratory mission because the rover involved which was called Curiosity, was simply too heavy to use airbags to land.
Answer:
The heavier weight of the MSL made airbag landing technology impractical.
Explanation: