Please choose the correct ending to complete the given sentence: Doing motocross: They are dressed in biking gear with protective helmets and clothing. They are going on hilly slopes and uneven terrain on their motorbikes. they

Ending1: use an intertube and continue riding through hilly, wooded areas. Ending2: are going down the hill through tall hilly hills. Ending3: go through extremely steep and dangerous dirt roads at high speed. Ending4: continue wheeling and adjusting with the use of their paddles and the pedals, making progress with speed.

Answer format: ending1/ending2/ending3/ending4