Please help ASAP!! Which of the following is true of castles built during the early Middle Ages?

They were built by peasants to house their families.

They were constructed mainly out of stone.

They were places of refuge for nobles and peasants in time of war.

They were difficult to destroy by fire, and therefore many survive to this day.

"when parents are their children are likely to react in a concerned way to the distress of others. warm and sensitive permissive authoritarian attentive, but discourage emotional expressiveness"

1. the responsibilities of the u. s. federal reserve system include overseeing the banking system and regulating the quantity of money in the economy setting the level of real interest rates working with congress to devise a financial plan for the country and execute the president's orders calculating and reporting the unemployment rate 2. to increase the supply of money when the economy is weak, the fed closes banks reduces inflation sells bonds buys bonds 3. the federal funds rate is the short-term interest rate that banks charge their best customers when borrowing banks earn on savings accounts with the fed banks charge each other when borrowing or lending to each other the fed charges banks when borrowing 4. when the fed increases the money supply and consequently lowers interest rates, the value of the dollar will rise by more in the market for foreign exchange, all else equal will fall, all else equal is not impacted by fed policy will rise, all else equal

Which factor contributed to the rise of african empires such as ghana and mali?