Question: What is the time period that 208861 is the population of Champaign County that shares a border with McLean County?
Options:
2004-05-12
1515-01-01
1655-01-01
2009-10-14
2013-02-01
1852-12-03
1990-10-01
1994-03-21
2017-08-10
2015-01-01