Respuesta :
A) The source is probably not valid because it is based on an opinion.
He or she that wrote it did not go into a lab and see if the resources are true its just based on what he thinks it is.
Answer
A)The source is probably not valid because the author is unknown.Explanation
This would be the answer because a forum is an area where users share their opinions on a particular topic and using forum for a research assignment would give you incorrect information. Also, without knowing the author you cannot be certain that the post is valid to use on the research assignment.