I – Most people know that Mount Everest is the highest mountain in the world.

II - However, there is another fact that many people don’t know: it has become one of the most dirty mountains in the world.

III - Mount Everest is one of the most tough and most exciting mountains to climb on Earth.

IV - It is not the coldest or the windiest place on Earth, but it comes close!

V - Local organizations have brought tons of trash down to the mountain.

(Adapted from https://ngl.cengage.com/assets/downloads/grex_pro0000000538/ grex2_su8.pdf) 

Choose the correct option.