If a variable can only assume certain values or options, and if it can be expressed through only whole numbers, then it is a discrete variable. For example, gender variable can assume either male or female option. Continuous variables, on the contrary, are those that can take any value between their bottom and top limits, that is to say, they can be expressed in fractions. For instance, the value that variable of weight can assume ranges from zero to infinity. The correct answer is C.