Answer:
The centeral idea is the main idea of the story which i can not read
Explanation:
Hi!
Every fall, the oak tree in the garden sheds its leaves.
The answer isn't their, because there is only one tree.
It isn't there because there isn't used as a possessive noun.
And it isn't it's because it's means it is.
So the answer is its.
Hope this helps! :)