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Read the passage and answer the questions that follow.
The current 'biggest' threat to climbers on the world's tallest peak, the former head of the Nepal Mountaineering Association said, is the staggering amount of human waste being left on its slopes with some estimates putting that number at more than 8,500 kilos for this season alone.
The biggest problem and concern now on Everest is human. It is impossible to know exactly how much litter is spread across Everest because it only becomes visible when the snow melts. But at Camp 2, two levels higher than Base Camp, Sherpas who worked on the government's cleanup drive this spring believe around 8,500 kilos of human waste was left there during this year's climbing season. The clean-up took 3 weeks, and the Sherpas were continually going up and down the mountain with sacks.
Melting conditions at Camp 2 create an odour that is sickening to climbers, and the waste will eventually contaminate water sources below and become a health hazard, Tshering warns. "During our expedition to Camp 2, eight of our 10 Sherpas got stomach illness from bad water at Camp 2," said John All, a professor of environmental science at Western Washington University who visited Everest on a research expedition.
Ang Dorjee, who heads the independent Everest Pollution Control Committee, has demanded that the Nepal government institute some rules. The problem is there are no regulations on how to dispose of the human waste. Some climbers use biodegradable bags that have enzymes, which decompose human waste but most of them don't.
Instead of using the makeshift toilets, many climbers dig a hole in the snow, letting the waste fall into small crevasses. However, rising temperatures have thinned the glacier, leaving fewer and smaller crevasses. The overflowing waste then spills downhill towards Base Camp and even communities below the mountain.
Local people living at the Base Camp use melted snow for drinking water -- and for them, the human excrement poses a health risk. Tshering and other mountaineers say the government should mandate the use of biodegradable bags for human waste. The bags are expensive and have to be imported from the United States.

How many Sherpas got ill?

A8
B2
C3
D10