Add the phrase that completes the thought in the underlined sentence. Help quick and i'll mark you the Branliest

Of the 168 hours in a week as a full time student you should spend how many hours per week on school work?

Which of the following must happen in order for productivity to increase? a. production levels remain unchanged while inputs increase. b. production levels rise while inputs decrease. c. production levels fall while inputs increase.

Igot a 80% on my final to os ya take these points in return