Which of the Following Would Most Clearly Be an Illustration

Which of the following would most clearly be an illustration of predictive research

A) a study whose goal is to assess the amount of child abuse in a particular community
B) a study whose goal is to determine why some teenagers are more likely than others to abuse alcohol or drugs
C) a study whose goal is to project how many children will suffer from malnourishment if funding for some social program is reduced
D) a study designed with a practical outcome in mind and with the assumption that some group or society will gain some benefit from it