As we know mountaineers experience problems in breathing while climbing mountain due to decrease in the density of air. Write about the kind of equipment carried by the climbers for protection against sunshine, temperatureand the lack of air

Oxygen cylinders, special jackets

Explanation:

Due to the mountaineers experience problems in breathing while climbing mountain due to decrease in the density of air there is usually the need for them to carry oxygen cylinders which helps them to breathe well to avoid death.

The special jackets are also very necessary due to the weather conditions they are subjected to as a result of the high altitude and closeness to the Sun.

the awnser is a

it is not b or c