News reports for Friday 8 January indicate that an elderly woman was badly injured and rushed to hospital following a car accident, which occurred at approximately 9:20 am in a side street in West bridge, a suburb of Bradfield. The driver of the car was a middle- aged male who claimed that icy road conditions and braking hard to avoid a runaway cat had caused the accident. A local resident walking his dog, and a couple of parents returning home on foot after taking their children to school, witnessed the incident. The following facts are also known: The car involved in the accident skidded off the road, mounted the pavement and collided with a garden wall. The drivers older sister, who was sitting in the back of the car at the time of the accident, was not wearing her seat belt. The local resident who was walking his dog at the time of the accident had defective eyesight and walked with the aid of a stick. Snow that had fallen during the whole of the previous day had been compacted by vehicles using the un-gritted side road and had turned to ice as a result of overnight frost. Shortly before the accident a person living in a house close to where the accident occurred had been heard calling for a stray cat to come home.

Question: The badly injured woman taken to hospital following the accident was the drivers older sister.
Options:
A. true, B. false, C. uncertain
Answer: "C"