Concept:The correct word is the one that fits the common expression about receiving a small or humble portion of bread.
Explanation:The phrase "even a crust of bread" means even a tiny, hard outer piece of bread.
It is used to show that someone is grateful for very little food.
Among the options, "crash", "crush", and "creche" are unrelated to bread.
Only "crust" refers to the outer layer of a loaf of bread.
Therefore, the expression naturally requires "crust".
Answer:D. crust