(1) If you gently press the test tube with your finger, the depth of the test tube will increase, the pressure on the air column in the test tube will increase, and the volume of air will be compressed, so the volume of water it displaces will decrease, and the buoyancy will decrease, so it will move down.

(2) If the outside temperature rises obviously, the temperature of the gas column in the test tube will rise, and the volume of gas will expand, and the volume of water it displaces will increase, and the buoyancy will increase, so it will move upward.

So choose D.