Diba was at a party and was talking and laughing with Sam. A little later, Diba overheard two people talking about it. "Did you see how close Diba was standing to Sam? Did you see Diba lean on Sam's shoulder? I hope Sam's partner doesn't hear about it." Diba was confused because Sam is just a friend. Diba misunderstood the concept of _________ distance.

A. Public
B. Social-Consultative
C. Personal
D. Intimate