a hard metal case with flexible foam lining a flexible metal case with smooth plastic lining a strong wooden case with lightweight plastic lining a lightweight wooden case with strong aluminum lining
I gave my students this multiple choice question: A scientist wants to collect several bird eggs on an island. She needs a case that will protect the eggs she collects. Which of the following cases would best protect the eggs?

Only one answer is correct among these 4 choices:
- a hard metal case with flexible foam lining
- a flexible metal case with smooth plastic lining
- a strong wooden case with lightweight plastic lining
- a lightweight wooden case with strong aluminum lining

Could you tell me which one is correct?

a hard metal case with flexible foam lining