Which country do most players of team Plymouth Whalers come from?
country and nation are synonyms; country where most players come from refers to MAX(COUNT(nation WHERE TEAM = 'Plymouth Whalers')); players refers to PlayerName; team Plymouth Whalers refers to TEAM = 'Plymouth Whalers';
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