Answer:
The correct answer would be option B and C, It is more concise and It is more easily understood.
Step-by-step explanation:
In the shorter version, the word 'Chain' replaces the longer sentence, ' long string of small metal circles welded together by a blacksmith', which is more commonly known by people. It makes the sentence shorter and concise and above all, easy to understand.
The sentence means that the chain is as strong as its weakest link, which means if any of the link of the chain is weak, the whole chain is considered weak, as it can break the whole chain.
So the shorter version is clearly easy to understand and is more concise, which gives a short compact and easy understand of what is being said.