This is the 3062nd most frequent Russian word.
избирательных
"Electoral" or "selective," depending on context.
The word "избирательных" acts as a descriptive adjective for "кампаний" (campaigns), emphasizing their nature related to elections.
Избирательных кампаний в этом году будет больше, чем обычно.
Electoral campaigns this year will be more numerous than usual.
Here, "избирательных" specifies the type of surveys, indicating they are associated with elections and voters.
Она проводит избирательных опросы для изучения общественного мнения.
She conducts electoral surveys to study public opinion.
In this sentence, "избирательных" modifies "студентов" (students), suggesting that the students making choices or being selective in their decisions are targeted.