What does the author suggest about the nature of Eads' accomplishments?

The suggestion that Eads' accomplishments stemmed from both planning and execution highlights the thoughtful and strategic approach he took toward his work. This acknowledges that Eads did not just rely on a stroke of luck; instead, he meticulously planned his projects and executed them effectively, allowing him to achieve significant technological advancements and contributions. This view emphasizes the importance of a well-laid-out strategy and hard work in achieving success, which is reflective of many achievements in engineering and innovation.

While aspects such as competition or misinterpretation by others may influence a person's achievements, they do not account for the deliberate efforts and foresight that characterize Eads' work. Similarly, attributing his accomplishments solely to luck undermines the skill and determination involved in his endeavors. Hence, the essence of the correct answer lies in recognizing the blend of thoughtful planning and diligent execution that was crucial to Eads’ successes.