The answer is A: highly diverse and C: dialectal. <em>Highly diverse</em> involves many different types of people, very different from each other, including their culture and language, that being informal makes easier to communicate. <em>Dialectal</em> is related to dialect, a form of language of a particular place. Also characterizes an informal language. <em>The standard language and specialized jargon are related to a formal language.</em>
