Why is it surprising that pillownauts choose to participate in research studies?

A. Pillownauts have little interest in doing research about human bodies.
B. Pillownauts can experience uncomfortable side effects from research studies.
C. Pillownauts prefer sleeping late on weekend mornings to helping with research.
D. Pillownauts doubt research studies will help people reach Mars.

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Understanding Informational Texts About Preparing for Space - Quiz - Level G

Pillownauts Improve Space Exploration
by Jennifer Mason

"Sleeping in on a Saturday morning can feel pretty great, but pillownauts take lying in bed to another level. In order to help NASA researchers understand what happens to the human body when it leaves Earth, pillownauts willingly take part in studies, despite the discomfort and changes to their bodies that they will experience. They know their work will one day help astronauts travel as far as Mars."