How did thomas jefferson become president a. he was elected b. the president died naturally. c. the president resigned d. the president was assinated

In those times the two people running for president who ever won became president and who ever lost became vice president so its very likely for a vice president to want to run again

Jefferson was the vice president john adams so the answer is is A

 Adams finished his presidentail term march 3rd 1801 so but he died july 4th 1826 so it cant be B or D

Richard Nixon was the first president to resign so it cant be C 

Carbon monoxide is usually more dangerous indoors.