DrJonas Is Conducting a Survey on Teenage Abortions and Advertises

Dr.Jonas is conducting a survey on teenage abortions and advertises for participants in local newspapers and teen magazines.He finds that 90 percent of teens report they don't regret their decision to have an abortion and appear to be mentally healthy following the procedure.What is the main overarching difficulty with the conclusions from his study?

A) There was no random selection so the respondents may not represent the population.
B) Teenagers have a greater tendency to be untruthful on surveys relative to adults.
C) It was likely the teenagers were trying to make themselves appear better than they were.
D) There are no major flaws with this study.