Which question is acceptable to be used on a survey?

The appropriate question for a survey would focus on obtaining clear, objective feedback that can be analyzed efficiently. Among the choices, asking about what was most satisfying about a shipping experience is an effective way to gather insights. This question encourages respondents to provide specific feedback about positive aspects, which can be valuable for understanding customer satisfaction and areas of improvement.

In contrast, the other options could lead to biased, unclear, or overly subjective responses. For example, questioning why non-US call center staff are difficult to understand may not yield constructive feedback and could be perceived as leading or biased. Similarly, asking respondents to explain feelings about their first thought of using a service is very subjective and may not provide actionable insight.

Therefore, the most appropriate question for a survey is one that seeks to quantify and qualify experiences in a manner that can help drive quality improvements, like what was most satisfying about the shipping experience.