Someone help me plz. I have no idea.

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

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

Can any one me on number 4? i do know that it’s not a cause i gotten that wrong on the first try.