To minimize the likelihood of respondents selecting the middle choice to expedite completing a questionnaire, it's typically best to use an odd number of answer choices. This layout ensures there is a definitive middle option, which can encourage respondents to select it.
Among the options provided, 5 and 7 are odd numbers. However, 5 options generally provide a good balance between having enough choices for respondents to reflect a range of opinions while also avoiding the extremes too much.
Thus, the best answer would be 05.