The 14th amendment is important and extends civil liberties because the courts have interpreted it in many cases to mean that state governments must guarantee certain rights.
Civil liberties refer to the laws that protect the citizen's rights to be treated equally.
Civil liberties are guaranteed by the bill of rights parts of the constitution and the due process clause of the 14th amendment is an important extension of civil liberties because it guarantees provisions of the Bill of rights at the state level.
Therefore, D is the correct option.
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