Final answer:
The problem Nathan identifies is that the structured English is not using a sequence, selection, or iteration structure.
Step-by-step explanation:
The problem Nathan identifies is that the structured English is not using a sequence, selection, or iteration structure.
Structured English is a way of describing processing logic using natural language and the three basic control structures: sequence, selection, and iteration.
In this case, the analyst's structured English does not include any of these control structures, which means it is not properly defining the flow of the program. Nathan's expertise allows him to recognize this issue and provide a solution.