Use the Following Information for Questions

Use the following information for questions:
Suppose you were to read about a study showing that people who sleep less than five hours a night have twice as much risk of a premature death as people who sleep seven or eight hours a night.
-The "baseline risk"in this context is

A) the risk of premature death for people who sleep less than five hours a night.
B) the risk of premature death for people who sleep seven or eight hours a night.
C) the risk of premature death for all people.
D) the risk of premature death at the beginning of the study for those in the study.