Low production at a single Exxon Mobil refinery in Southern California is keeping gasoline prices higher than they are in many other parts of the United States, where a domestic oil boom has driven prices lower over the last year, according to an article in the Los Angeles Times.
Utilize the input text as a context reference, choose the right relationship between 'Exxon' and 'gasoline' from the options.
Options: chief executive officer, member of, position held, product/material produced