Ronan Hickey analyzed almost 2000 different dialects of the bottle-nose dolphins.

参考答案:

B解析：问题中的关键词组是of the bottle-nose dolphins。利用问题句中的特征词Ronan Hickey(人名)和2000 different(不同的)dialects为答案线索，对应原文第三段第一句，…student Ronan Hiekey digitised and analyzed a total of 1,882 whistles from the Irish dolphins and those from the welsh dolphins…可知Ronan Hickey