Hypothesis tests for proportions can be used if the parameter of interest is a proportion of a population in which there are two different categories. Such as, mid-term results of students who have a score below or above fifty, or quality engineers test the proportion of parts that are defective or not defective. From these examples, it is clear that the statistical hypothesis test involving a proportion of the population can be considered as a binomial experiment since there are two outcomes.  The correct answer is B.