Question

The scenario may be considered which of the following?

Answer 1

My best guess is "biased".

Explanation:

The question "Should the school day be lengthened to improve academic achievement" contains within it a desired reason to lengthen the school day; it is encouraging students to answer "yes". As such, students will be responding to this question after hearing this reason, so their responses may be different than if they based them on only their own prior opinion.

One could make an argument for "unpopular" as well, because it is a common trope that students as a whole do not like school, so we can expect their responses to be heavily swayed towards "no", regardless of any benefit they could gain from it. (Also, the students who would vote "yes" may recognize this unpopularity and be tempted to "vote with the crowd".)