see sample answer below

a) “The Preamble of the Constitution secures “the blessings of liberty” to the American people, to their descendants, and to every generation.”
b) “The historic, comprehensive, and sometimes controversial amendments, shape many aspects of American life.”
c) “Today, Americans can read the text of the Bill of Rights online, they can purchase printed texts, or they can see one of the original copies on display at the National Archives.”

see sample answer below

Amendment 1 and amendment 3 have serial commas.