What is the most important reason for providing an accused criminal the miranda warning?

if citizens are not provided their miranda rights, they may give the officers incriminating information that connects them to a crime.

if someone is convicted of a crime, and he wasn't provided his miranda warning when arrested, his prison time could be much shorter than it should be.

if an accused criminal is provided a miranda warning, a court hearing that includes a jury is not usually necessary for a conviction.

if police gather information from an accused criminal without providing miranda rights, they could convict the wrong person.

a best description that resulted a division among labor in the early farming communities in their period was there was a change in their society in terms of having social roles to develop and change that led complications and divisions in the society.

can someone me with this question:  

1) the end of the conflict between the north and the south didn’t just mark the end of a war; it marked the end of an entire way of life.” which statement best describes what this statement means?  

a) the southerners were no longer free and were controlled by the northern states.

b) the industrial economy in the north was not sustainable.

c) slavery became illegal, which changed completely the south’s labor force and the agricultural economy was destroyed.

d) the states decided to relinquish their independence and return to britain’s rule.