The percentage of people between the ages of 18 and 24 living with their parents increased from 48 percent in 1980 to 53 percent in 1986. It can be concluded that in 1986 it was harder for people in this age group to afford to live by themselves. The conclusion drawn in the passage above depends on which of the following assumptions? ['People in this age group who lived with their parents did not make any financial contribution toward housing expenses.', 'People in this age group who could not afford to live by themselves preferred living with their parents.', 'There are people in this age group who although they lied with their parents at the time of survey, had previously lived alone.', 'The number of rental housing units suitable for single people dropped between 1980 and 1986.']