Final answer:
The thesis "You can prevent health problems by getting an annual health screening" is best organized using a cause and effect pattern because it clearly connects the action of getting screened with the outcome of preventing health issues.
Step-by-step explanation:
The speech thesis "You can prevent health problems by getting an annual health screening" would align most effectively with a cause and effect pattern of organization. This is the most logical choice given that the thesis establishes a direct relationship between the action of getting an annual health screening and the outcome of preventing health problems. Utilizing the cause and effect organizational pattern allows the presenter to discuss various health issues (effects) and explain how regular health screenings can help in their prevention (causes).
While a topical pattern could be used to divide the thesis into subtopics, and a chronological pattern would typically lay out ideas in a time sequence, they are not as fitting as the cause and effect pattern in this scenario. Similarly, a spatial pattern would be inappropriate as it arranges information according to location or geography, which is irrelevant to the thesis posed.