The term that best describes an economic push factor from the options provided is hyperinflation.
Economic push factors are conditions that drive people to leave their home country due to difficult economic circumstances, and hyperinflation represents extreme inflation that erodes the value of money, leading to economic instability and hardship.
Brain drain, on the other hand, is typically a result of these push factors rather than a direct push factor itself. Land ownership and remittances do not fit the definition of a push factor either.