There should be options to choose from for this question and I managed to find them elsewhere. They are:
A. encourage his friends to finish their homework on time
B. provide evidence against him in an academic investigation
C. prove he understands how to use technology effectively
D. help other students find useful homework resources
The correct answer here would be B. provide evidence against him in an academic investigation. Essentially his actions will get him in a lot of trouble at school. Students are not encouraged to find answers to their homework online and this is is seem as a form of cheating. There might possibly be an academic investigation and if so his post can be used against him as evidence of what he did.