Final answer:
The most likely feedback Ella would receive from her teacher is that she needs additional sources.
Step-by-step explanation:
The most likely feedback Ella would receive from her teacher is b. Ella needs additional sources.
Although Ella used the Barrera passage as her source, it is important for research to have multiple sources to ensure accuracy and credibility. Using additional sources would provide Ella with a broader range of information and perspectives on World War II seaplanes.
Having multiple sources also allows for a more comprehensive analysis of the topic and the ability to address potential counterarguments, which can strengthen Ella's research.