Which of the following best describes the action of the wooden block on the floor before and after the floor yields when an iron cylinder of mass 25 kg is placed on top of the block, causing them to go down with an acceleration of 0.1 m/s²?

Options

1. AThe block exerts an upward force on the floor before yielding and a downward force on the floor after yielding
2. BThe block exerts a downward force on the floor before yielding and no force on the floor after yielding.
3. CThe block exerts no force on the floor before yielding and a downward force on the floor after yielding.
4. DThe block exerts an upward force on the floor before yielding and no force on the floor after yielding.