Read the sentence.

christopher columbus born in genoa never did reach mainland north america

which revision is necessary to create proper punctuation within the sentence?

the phrase “born in genoa” should be set off with commas.
the phrase “christopher columbus” should be set off with commas.
the phrase “never did reach” should be set off with commas.
the phrase “mainland north america” should be set off with commas.

The answer to your question would be that the revision that is necessary to create proper punctuation within the sentence is the following one: The phrase "born in Genoa" should be set off with commas.

"Born in Genoa" should be set off with commas because it is an appositive phrase.  An appositive is a noun or noun phrase that renames another noun right beside it. As the information provided by the appositive is not relevant, it should be separated from the rest of the sentence with commas.

The correct answer is - The phrase “born in Genoa” should be set off with commas.

Since the phrase born in Genoa is an appositive phrase, it needs to be set off from the rest of the sentence with commas. Appositive phrases are always separated with commas, as they are used to describe nouns before them, as is the case in the example above. The phrase describes the subject, Christopher Columbus.

b

explanation:

the development of trade during the middle age increased to the change given in the agriculture, which gave money, industry and markets a bigger importance in economy. the agriculture production was more than the consumption, which meant the creation of wider markets out of the areas. besides, with the end of multiple wars, the population increased and new trade routes were created.