( THE CORRECT ANSWER WILL GET BRAINLIEST !!!!!!!! )

In which of the following is the word core used as technical vocabulary specific to the field of astronomy?

A) Although the apple appeared fine from the outside, its core was rotten.

B) The four high school textbooks make up the core of the new publishing program.

C) Over the years I have developed a strong core group of friends who have become indispensible.

D) White dwarf stars are the leftover cores of stars that have discarded their outer layers.