Which sentence from the text suggests that scientists are serious about the idea that Europa might support life?
A) At least 150 scientists are already working on the instruments that will travel on the spacecraft.
B) They loaded 17,000 kilograms (18.5 tons) of gear and food into a plane mounted with skis.
C) The scientists drill into the thick ice and collect a long, tube-shaped sample called a core.
D) Snowflakes, says Garrett, offer many telltale clues to the stormy, sky-high conditions in which they formed.
The correct answer is A) At least 150 scientists are already working on the instruments that will travel on the spacecraft.
Explanation: This sentence indicates the significant investment of time and resources by a large group of scientists, which suggests their serious commitment to exploring Europa and the potential for it to support life. The involvement of many scientists in preparing instruments reflects the importance of the mission and the seriousness of the research regarding the moon’s habitability.