The correct answer is the option A, which means that, as one of the two broad classifications of science, social sciences study social events and humans’ social and cultural activities. The rest of the options, which happen to be B, C, D, and E are not correct explanations regarding the classification of science. For instance, humanities is the synonym for social sciences not physical sciences. Not social but physical sciences is called natural sciences. In addition, unlike D, psychology and ethnology are the branches of social sciences. Unlike E, physiology, zoology and botany are the sub-branches of physical sciences.