Exhale now! You will notice that when you breathe out, your ribs come inwards and downwards. So 1 is correct.
However, the diaphragm does not contract while exhalation. It only contracts when you inhale. So 2 is incorrect.
Think about statement 3. Air goes from high pressure to low pressure. Since air comes out of your lungs into the surrounding air, it must be going from high pressure to low pressure. Therefore, pressure in lungs must be high when you exhale.