Final answer:
A Physics student working alone at night in a machine shop was killed in a lab accident.
Step-by-step explanation:
The accident highlighted in 'The 10 Worst Lab Accidents' on Canvas was the death of a Physics student working alone at night in a machine shop. The specific cause of death was not mentioned in the information provided. However, options A and B, electrical fire and explosion of chemicals, are possible hazards in a machine shop. Option C, radiation exposure, is less likely in this scenario. Option D, working alone at night in a machine shop, could increase the risk of accidents due to lack of assistance or supervision.