Microleakage into the Interface Between Tooth Structure and Restorative Material

Microleakage into the interface between tooth structure and restorative material is responsible for much of the _____ observed following tooth restoration.
1) recurrent decay
2) marginal staining
3) postoperative sensitivity
4) tarnish

A) 1,2,3,4
B) 1,2,3
C) 2,3,4
D) 1,2