Which did president carter fail to do?
promote détente with communist countries
create a peace agreement between israel and egypt
free americans taken hostage by iran
take action against the soviet invasion of afghanistan

What did President Carter fail to do?

President Jimmy Carter’s failure to get the hostages back ruined his re-election chance in 1980.  We might also note that the taking of the hostages was itself an action aimed at President Carter.  The Iranian Revolution had ousted the shah of Iran, a US-backed leader.  The former shah, Mohammad Reza Pahlavi, living in exile in Mexico, was found to have cancer, President Carter allowed him to come to the United States for treatment.  This enraged the Iranians, who thought that the US was perhaps trying to bring the shah back to power.  That's when the hostages were taken.

option b, all states follow similar rules and legal process is the right answer.

the 14th amendment in the constitution of america was enacted in july 1868, which include the citizenship, due process, and the equal protection under the law. this amendment was a response to the issues related to former slaves following the american civil war.

the citizenship clause granted citizenship to all persons born or naturalized in the u.s,.   due process of clause asserted that states may not deny any person "life, liberty or property, without due process of law and the equal protection clause declared that a state may not deny to any person within its jurisdiction the equal protection of the laws. the above mentioned excerpt from the constitution of the united states, ensures the citizenship,due process, and equal protection under the law.