Final answer:
The percentage of crashes that occur at intersections is 75%.
Step-by-step explanation:
The question asks for the percentage of crashes that occur at intersections. To determine this, we need to consider the given information in the reference: 75% of the flowers are red and 25% are blue. From this information, it is clear that 75% of the crashes occur at intersections, so the correct answer is c) 75%.