Patrick Donaldson is using a research firm to better understand a potential target market for his company's new product, a pain medication. The research design proposed by the research firm includes randomly surveying consumers who are likely to take the medication (those older than 65 who have arthritis pains). Patrick views the questionnaire proposed by the research firm. Two of the questions are: (1) Are you older than 65? If "yes," continue to Question 2. (2) Do you experience pain from arthritis? If "yes," continue to Question 3. Questions 1 and 2 are considered to be:
A) disguised questions.
B) skip questions.
C) screening questions.
D) undisguised questions.
E) classification questions.
Answer: c. screening questions