A 45 year old female patient returns to your clinic with complaint of food lodgement in interproximal area of 47. On intraoral examination, 47 is restored with disto-occlusal amalgam restoration. What can be the most probable reason for this patient's  problem?
Contact area placed more gingivally Occluso-gingivally contact area is wide Bucco-linguallly contact area is wide Contact area placed more occlusally