Traffic Safety: Here is a passage from a study published by the National Highway Traffic Safety Administration in 2007.
"The National Occupant Protection Use Survey (NOPUS) is the only probability-based survey of driver cell phone use in the United States. The survey observes usage as it actually occurs at a random selection of roadway sites, and so provides the best tracking of the extent to which people in this country are using cell phones while driving."
NOPUS observed 43,000 drivers in this study.
What population is the focus of this study?
A. drivers in the U. S.
B. drivers in the U. S. who use cell phones while driving
C. the 43,000 drivers observed in the study
A. drivers in the U. S.

The correct answer is letter B

All statistical research must serve a target audience, as it is based on this set of people that data are collected and analyzed according to the research principle. This target audience is called the population and is a group of people who have their own characteristics, for example: users of a health plan, members of a football team, employees of a company, voters in a municipality, state or country, students at a school, union members, members of a household, and various situations involving a general group of elements. The population can also be related to a set of objects or information. In statistics, the population is classified as finite and infinite

the united states has a federal government. the president is the head of the federal government of the united states. however, each state forms its government for administration purposes. the powers of the state governments are exercised within restricted state boundaries. and citizens participate in this government by voting.

i think it's b or c hope this