Which survey is most likely to have the least bais?

Which type of place is most likely to have members of kingdom- Fungi ?

Which of the following is most likely to have higher breathing rate?

Which of these is least likely to act as a Lewis base

Which of these is least likely to act as Lewis base -

Which of these is least likely to act as Lewis base?

Which of these is least likely to act as Lewis base?

Erica is conducting a survey about the proposed increase in the sports budget in the Hometown School Distrinct. Which survey method would likely contain the most bias?