What percentage of Australia speak English ?

Explanation:

Pretty much everyone in Australia speaks at least a little English as it’s the only language used in most contexts and it’s pretty hard to get by without knowing at least a few words. Some new immigrants from non-English-speaking countries initially don’t speak English but nearly all of them learn at least a bit. A very few older people who are mainly house-bound may not feel the need to speak any English and rely on younger relatives to translate. But this is probably less than two percent of the population. In a 2016 survey over 96% of the population said they spoke only English or spoke English well

The correct answer is c.motivates producers or consumers to take action.

They are not by force and nobody makes you do anything, but the incentives are often too good to pass which means that C is the only appropriate answer.