Which sentence is written in compliance with the guidelines for commas?
the famous author, judy blume, is coming to speak at our school.
the famous author, judy blume is coming to speak at our school.
the famous author judy blume is coming, to speak at our school.
the famous author judy blume is coming to speak at our school.

Option (iv) is the correct answer.  

The famous author Judy Blume is coming to speak at our school.

This is the case of use of commas with appositives. An appositive is a word or phrase or clause that identifies the noun/noun phrase that precedes it.  

Commas are used to set off the appositive from the noun/noun phrase that it identifies if the appositive is not essential to understand the meaning of the noun/noun phrase and is only providing an extra information. In case the noun/noun phrase itself does not convey the complete meaning and an appositive is essential to understand the complete meaning of the sentence then commas are not used to set it off from the noun/noun phrase.

In this question, the noun 'author' does not convey complete information and the appositive 'Judy Blume' is essential to properly understand its meaning. Here appositive is an essential part of the sentence and is not meant to provide any extra information. Hence, commas should not be used to set the appositive off from the noun. Thus option "The famous author Judy Blume is coming to speak at our school" is the correct answer.

just took the quiz and this is the right answer

what did the protagonist say?

as we know, the english language is spoken all over the world by native and non-native speakers and has become the most certain tool when it comes to communicating. businesses, schools, even romantic relationships depend on it to keep thriving. in addition, it is the language of the internet not only because most of the content available is in english, but also because people prefer to use it when talking to others, since it's the language everyone supposedly learns.

yet, there have been some current claims that chinese will soon take over as the most important language in the world. china's magnitude has never been more evident and doing business with the chinese is a gold mine for any country. we now see language schools offering chinese courses as commonly as english.

however - even though we cannot deny china's importance and the advantage it is when someone takes the time to learn the language their business contact speaks-, people in general seem to be ignoring the aspects that seem to keep english as the chosen one of languages. one of them has been mentioned above: it is the language of the internet. also, chinese people are still learning english, since it opens doors in communicating with practically everyone else, from every single country.

note: if this is not the sort of transition you need, let me know. : d