What was the outcome of the 1971 World Championship Victory Race due to a fatal accident on lap 15?

A. The result was taken from the race order after 14 laps, declaring the current leader the winner
B. The race was extended to 50 laps to ensure a fair result
C. The race was restarted from the beginning after a 30-minute delay
D. The race was abandoned and no winner was declared
Answer: 