Only 1 Is False, Which one is false?

Which of the following statements is FALSE? For a short-term forecast, you need to use arithmetic average of historical returns. An investor can use weighted average of geometric and arithmetic average returns to forecast future returns. For a long-term forecast, you need to use geometric average of historical returns. For a short-term forecast, you can be overly pessimistic if you use geometric average returns. For a long-term forecast, you can be overly pessimistic if you use geometric average returns