What is the cause of the following sentence?

The skier slipped on the slope.

OPTIONS:
- She dropped her ski poles.
- She hit a patch of ice.
She hit a patch of ice.
Vad är orsaken till följande mening? Skidåkaren halkade i backen. - Hon tappade sina skidstavar. - Hon träffade en isfläck.
What is the reason for the following sentence? The skier slipped on the hill. - She dropped her ski poles. - She hit an ice stain.
Hon träffade en isfläck.
She hit an ice spot.