[Solved] According to the text,which of the following resulted from protests and strikes of the industrial working classes? A) labour unrest,social upheavals,and a poor economy B) tougher management negotiations with workers C) a larger percentage of nonunionized employees D) the evolution of the modern 40-hour workweek Observations: The act of noting and recording something with instruments or the naked eye as part of a scientific or empirical study. Untreated Population: A group in a study or an experiment that does not receive the treatment or intervention being tested. Significance Level: The threshold in hypothesis testing that determines the probability of rejecting the null hypothesis when it is actually true, often denoted by alpha. Treatment Group: In experimental research, a group of subjects who receive the treatment or intervention under study.