Data come in various forms and are measured in different ways. For example, a doctor measures your blood pressure with an instrument, a survey researcher asks you a question and you give a verbal response, you go on holiday to a particular country, you are at a certain age and have a certain income, you have a grade for a completed university course, or this past week you have gone to the supermarket a certain number of times, and bought a certain basket of products, etc. Blood pressure, question response, country, age, income, course grade, number of supermarket visits and purchased products, these are all statistical variables.

As also understood from the information given, the correct answer is E.