How would you shift to a lower gear while driving uphill in an automatic transmission vehicle, without moving the gear handle?

1. A By taking the foot off the brake pedal without giving gas, in order to get the right speed.
2. B By a sharp and quick pressure (“kick down”) on the accelerator, or by applying a designated electric switch.
3. C By stepping firmly on the brake pedal.
4. D By gradually stepping on the accelerator, until getting the desired result.