Final Answer:
Eugene tells Junior that he could not do what he is doing because he lacks the skill set, which surprises Junior (Option A).
Step-by-step explanation:
In the given scenario, the key lies in understanding Eugene's limitations. The choice A, "He lacks the skill set," is the most fitting answer. This is surprising to Junior because it implies that Eugene doesn't possess the necessary expertise or abilities required for the task at hand.
This revelation contradicts Junior's expectations, creating a sense of astonishment. To elaborate, if Eugene had promised not to do it (Option B), Junior might have been disappointed or betrayed, but the surprise element comes from the unexpected revelation of a lack of skills.
Moreover, the surprise factor intensifies when considering Option C, "He's physically unable to." If Eugene were physically unable, it might be more predictable for Junior, depending on the nature of the task. However, the disclosure that Eugene lacks the skill set adds a layer of unpredictability, as skills are often associated with learning and experience rather than inherent physical abilities.
Lastly, Option D, "He never attempted it before," might lead to surprise, but it lacks the explicit mention of a skill gap. Attempting something for the first time doesn't necessarily mean lacking skills, as one can still have the required abilities. Thus, the unexpected revelation of a skill deficiency in Option A provides the most convincing explanation for Junior's surprise in the given context.