In which year did Around the Horn place the most orders?
Around the Horn is the CompanyName; year with the most order refers to Year (OrderDate) where Max(Count(OrderID))
SELECT STRFTIME('%Y', T2.OrderDate) FROM Customers AS T1 INNER JOIN Orders AS T2 ON T1.CustomerID = T2.CustomerID WHERE T1.CompanyName = 'Around the Horn' GROUP BY STRFTIME('%Y', T2.OrderDate) ORDER BY COUNT(T2.OrderID) DESC LIMIT 1