【正确答案】 D

【答案解析】由第三段第三句“Football supporters，most of whom declare their loyalty by wearing their team's colours，in the form of shirts，are not known for their team and behaviour． They are often very noisy，shouting noisy encouragement to their team and singing deafening songs．”可知。这三个选项都是他们表示忠诚的方法。故答案为D。