He pardoned former President Nixon
He was envious of hicks performance because he craved attention and always felt the need to outdo him
Twain saw hick as someone that is arrogant and always feel he is superior than other humans
The best option from the list would be that "<span>c. He wore civilian clothes rather than uniforms or royal attire," since he had a general aversion to the "fanfare" associated with the Presidency. </span>
B.
For those that could not write (So most), they carried a seal around either on a necklace or otherwise that they could use to stamp with ink to signify 'signing' something.