Read the passage below and answer the questions that follow.
Standard English refers to the authoritative and correct use of the language, the medium of expression for government and education. Its opposite is a dialectal variant of the language, that is, accepted and recognized words, expressions and structures peculiar to a smaller group of language users who are generally set apart from standard usage by cultural group or geographical region.
For example, Nigerian, American, Irish and British English differ from one another in many respects and each is identifiable, yet in every case the standard (formal) variety approaches a single and hypothetical classification known as International English.
As one moves towards informality and away from the observance of strict rules, emphasis falls on the difference between dialects. In addition to American English being distinguishable from British English, it is also true that British English is not uniform within the United Kingdom. The level of formality is determined by education and aspiration, while dialects vary from region to region.
According to the author, Nigerian and American english are
A. standard varieties B. registers C. different languages D. different styles
