Explanation:

- Dhyan Chand is ______ one of the greatest hockey players of all time.

- Options:

- thought: This implies an element of belief or opinion but is less commonly used in this context.

- observed: This is more about noticing or seeing rather than forming a judgment or opinion.

- considered: This term is most suitable here as it indicates a widely accepted belief or judgment about someone’s status or abilities.

- believed: This suggests a personal or widespread belief but is often used in a less formal way compared to "considered."

- Overall, "considered" is the best fit for expressing a widely held belief or recognition.