According to the constitution, which of the following is a requirement to be a candidate for president?
a. to be a senator, representative, or governor
b. to be a high school graduate
c. to be at least 35 years old
d. to be a christian

The President of the USA is not required to have ever held any office
or been elected to anything.  A candidate's level of education or training
for anything is irrelevant, and it would be totally un-American to impose
any sort of religious test.

In fact, a candidate for president is not required to have any skills, talent,
ability, experience, or qualifications of any kind.

The only constitutional requirement is that the candidate will need to turn
35 years old by the time s/he takes office.

That president would be none other than president warren g harding , return to say of life before wwi

He issued the emancipation proclamation. it started changing slavery, and eventually lead to the freedom of slaves.