Marialexa Conducts an Economic Study and Asks Her Participants to Provide

Marialexa conducts an economic study and asks her participants to provide information about their family incomes.First,they are asked to check one box from a list of three,indicating whether they consider themselves low-income,middle-income,or high-income.She refers to this as the self-identification variable.Then,they are asked (if they are willing) to provide their annual income in dollars.She refers to this as the dollar-figure variable.The study is both confidential and anonymous,and most people answer both questions.Which of the following statements accurately describes the data Marialexa collects?

A) The self-identification data are ordinal data and the dollar-figure data are ratio data.
B) The self-identification data are nominal data and the dollar-figure data are ratio data.
C) The self-identification data and the dollar-figure data both are interval data.
D) The self-identification data and the dollar-figure data both are ratio data.