Which option most accurately states a central idea of ""Principles of Conservation""?

The options are not given but the answer is;

The Central idea is "Conservation means the greatest good to the greatest number for the longest time'

Explanation:

The Central idea in a sentence or speech is the main point the writter is making and wants the reader to infer to it or remember it most.

The Central idea is the main idea or main point of the write up or aticle . It usually the first sentence in a write-up and the writer give more details or information to support it.

From the question, the Central idea is conservation means the greatest good to the greatest number for the longest time

where are the answer choices?