One survey finds the following representation for robbery offenders: African Americans -32%; white -51%; Asian-17%. Another survey, talking to the exact same people, finds the following: African Americans - 28%; white -38%; Asian-17%; Hispanic-17%. What is the likely data problem? a. One survey used "Hispanic" as a separate racial/ethnic category; the other survey did not have "Hispanic" as a separate racial/ethnic category. b. One survey allowed for respondents to choose multiple racial groups if they were identified as multiracial; the other survey did not. c. One survey used official statistics; the other survey used self-report. d. One survey assumed the race of the respondent; the other survey asked