Mary Hayes was shopping with her partner Alan one frosty January morning. Their children, Fred, Sam and Charlie were at home being looked after by Alans mother. Mary and Alan were taking advantage of the January sales to look for a new pair of shoes for Mary and a suit for Alan. After finding the items they wanted they called into a supermarket to get the weeks groceries. Later, as they were walking back to the car park, Mary slipped on some steps and injured her arm and grazed her knee. Alan drove Mary to the local hospital where an X-ray revealed that she had broken her wrist. It is also known that: There was a handrail on the steps. Mary was carrying the sale items while Alan carried two large bags of groceries. Alan was walking in front of Mary. While in the supermarket Mary said that she was feeling dizzy. An elderly gentleman had fallen on the steps the day before.

Question: Mary fell because the steps were slippery.
Options:
A. true, B. false, C. uncertain
Answer: "C"