Answer:
Option b. Assertion - preference
is the correct answer.
Step-by-step explanation:
The following given statement,
They conducted a study in which a group of healthy young men slept 8 hours one night, and then abstained from sleep another night.
lies under the category Assertion- Preference
Assertion can be defined as statements, phrases or clauses that claim or declare other sentences true.
whereas, Assertion-preference will be briefed as a category of assertion which based totally on ones preference. It is subjective to ones choice and such statements belong to the heart of our believes.
I hope it will help you!