Question: Which country do most players of team Plymouth Whalers come from?
SQL: SELECT T.nation FROM ( SELECT T1.nation, COUNT(T1.ELITEID) FROM PlayerInfo AS T1 INNER JOIN SeasonStatus AS T2 ON T1.ELITEID = T2.ELITEID WHERE T2.TEAM = 'Plymouth Whalers' GROUP BY T1.nation ORDER BY COUNT(T1.ELITEID) DESC LIMIT 1 ) AS T