How did Jerome become crippled in the movie?

In the movie "GATTACA," Jerome becomes crippled after an accident where he walked in front of a car. This incident is a pivotal moment that illustrates the unpredictability of life, especially for genetically engineered individuals like Jerome, who are designed for perfection. Despite being an ideal human in many respects, he suffered a tragic and random event that left him physically impaired. This portrayal emphasizes the film's themes around the limits of genetic determinism and the randomness of life circumstances that can affect anyone, regardless of their genetic makeup. The other scenarios provided do not reflect what actually occurs in the film, aligning the narrative with a deeper message about the fragility of human existence.