Dialogue: Emily: "Hey Mark, I'm calling about the project. Did you manage to finish your part?" Mark: "Oh, Emily! I was just about to call you. I'm having some trouble with the data analysis. It's more complex than I thought." Emily: "I see. Do you want me to come over and help you with it?" Mark: "That would be great! Are you free in an hour?" What can be inferred about Emily and Mark's relationship from this conversation?
A) They are colleagues working on a project together.