Which of the Following Is Not an Issue with Respect

Which of the following is not an issue with respect to Kearney and Levine's measurement of teen use of birth control and abortion?

A) Use of only one data source to measure the use of birth control and abortion
B) Lack of information about the age of those searching or tweeting about birth control and abortion
C) The assumption that interest in birth control and abortion reflects actual use
D) Aggregate data for geographical areas may not correspond to individual actions of teens within those areas