Suppose that you have spent some time thinking about how you are going to discuss a certain issue with a friend. later, you try to decide whether you had actually discussed this issue, or whether you simply imagined doing so. this is an example of:

Source-monitoring

Explanation:

Source monitoring refers to a mental test that humans perform in which they determine what is a real memory as opposed to a dream, a movie or some other source that does not fit with reality. This can further be divided into external source monitoring, which focuses on sources in the individual's environment, and internal source monitoring, which distinguishes among various sources within the individual's mind.

answer; archaeologists;