Both Edward Grey and Kaiser Wilhelm II emphasized the importance of supporting allies in their speeches regarding entering World War I. While Grey expressed the necessity of supporting Belgium and understanding the broader implications of alliances, Wilhelm II focused on the idea of Germany needing to defend its allies and the nation itself against perceived threats.
In this context, the most accurate agreement between their positions is:
B. It is important to support an ally.
While their motivations and perspectives on the war differed, both leaders acknowledged that supporting allies was crucial to their respective nations' stances as the war began.