Final answer:
The song "Salt Peanuts" was fitting for President Carter due to his own modest background as a peanut farmer and the symbolic simplicity he represented, as well as it being a subtle reference to Carter's efforts in the Strategic Arms Limitation Talks (SALT II).
Step-by-step explanation:
The song "Salt Peanuts" was an appropriate performance for President Jimmy Carter because it can be seen as a nod to his domestic policy and symbolic actions that promoted a more humble and down-to-earth image, mirroring the themes of simplicity and ordinary American life, much like the straightforward and commonly encountered snack, peanuts, which is also a reference to Carter's background as a peanut farmer.
Additionally, the title "Salt Peanuts" could be seen to make an indirect reference to the Strategic Arms Limitation Talks (SALT II), a part of Carter's foreign policy efforts to reduce the number of long-range missiles and bombers, which was an important aspect of his presidency. Performing such a song at an event for Carter could be both a light-hearted allusion to his past while simultaneously touching on the more serious matters of international relations and nuclear armament that were pertinent during his administration.