Final Answer:
Form 300A OSHA document summarizes occupational injuries and illnesses at an operation throughout the year. Therefore, the correct option is A. Form 300.
Step-by-step explanation:
The OSHA document that summarizes occupational injuries and illnesses at an operation throughout the year is Form 300A. This form is part of OSHA's record-keeping requirements and serves as an annual summary of the more detailed Form 300 log, which records individual incidents. Form 300A, titled "Summary of Work-Related Injuries and Illnesses," must be completed by employers and posted in a visible location at the workplace from February 1 to April 30 each year.
Form 300A provides a snapshot of the workplace's overall safety performance, including the total number of recorded injuries and illnesses, the types of incidents, and the number of days employees spent away from work due to these incidents. It helps employers and employees assess the effectiveness of safety programs and identify areas for improvement. Therefore, the correct option is A. Form 300.