how does a simmering pot of spaghetti sauce illustrate convection currents

warmer sauce at the bottom of the pot is denser so it rises, forcing cooler sauce down when it is warmed

the pot is only simmering so there are no convection currents

warmer sauce at the bottom of the pot is less dense so it rises forcing cooler sauce down where it is warmed

warmer sauce at the top of the pot is denser so it sinks to the bottom of the pot where it is warmed even more
I think that it is c am i right?