The Idea of Time Inconsistency

The idea of time inconsistency:

A) explains how it can be rational for someone to say he's going to eat a salad for dinner each night this week and end up eating pizza four out of five nights instead.
B) explains how it can be rational for someone to pay more for something on his credit card than if he were to pay cash for the same thing.
C) explains why people refuse to ignore only some sunk costs.
D) Time inconsistency doesn't explain any of these behaviors.