4. The chart on the right shows data for different students climbing up the same flight of stairs. Which student does the most work?
(A) A
(B) B
(C) C
(D) D

Which of the following is a direct benefit of the use of assembly lines in production a. laws against theft fraud and coercion are needed to protect free choice. b. the government needs to plan efficient outcomes. c. competition among producers by itself cannot ensure a wide range of consumer choices. d. works pressure the government to guarantee minimum wages