Final answer:
The excerpt demonstrates that decontamination is a procedure for removing potential contaminants from objects returning from space, which can sometimes be damaging to delicate items, such as seed bags.
Step-by-step explanation:
The information provided in the excerpt allows the reader to understand the meaning of the word decontamination within the context of space exploration. The seed bags that burst open during the decontamination process indicate that decontamination procedures are a set of actions taken to remove potential contaminants from objects or people returning from space to ensure that no unwanted biological material is introduced to the Earth's environment. This process can be rigorous and possibly damaging to sensitive items, such as the mentioned seed bags.
The correct answer to the question is D. It explains the procedures that astronauts must go through when returning to Earth. This choice is correct because it directly relates to the concept of decontamination as a cleansing process that is a standard protocol for materials and personnel returning from space missions.