What is the definition of cache and in what circumstances would it be appropriate to use it

"Cache" - a collection of items of the same type stored in a hidden or inaccessible place.

Ex; In preparation of the drought, the farmer has stored a sizeable cache of water tanks.

The troops are looking for the former dictator’s cache of gold bars.

When digging in the backyard, I discovered a cache of antique coins.

Did the troops ever find the cache of nuclear weapons?

The archaeologist hopes to find a cache of artifacts on his next dig.

1# the answer is c

2#the answer is a