For an essay focused on how major safety concerns in the food industry have been fixed over time, particularly highlighting the actions of historical figures and the timeline of these changes, the best text structures would be:
A. Sequential - This structure would allow you to present the historical developments and actions taken in chronological order.
C. Problem and solution - This structure could effectively highlight specific safety issues in the food industry and the corresponding actions taken by historical figures to address those problems.
These two structures would help effectively convey the evolution of food safety concerns and the solutions implemented over time.