Which sentence contains a correctly punctuated nonrestrictive modifier? Jake, who is twenty-seven, is studying to be a yoga teacher.
Jake who is, twenty-seven, is studying to be a yoga teacher.
Jake who is twenty-seven is, studying to be, a yoga teacher.
Jake, who is twenty-seven is, studying to be a yoga teacher.

The first one.

Explanation:

The commas separate some unnecessary information, which is about Jack being twenty seven. The others sound awkward and incorrect.

You also want to look for some dependent or independent clauses between punctuation.

d) the narrator even suggested that the white whale, moby d, was ubiquitous and present in every ocean at every moment.  

in the 1890s, southern states enacted a new form of black codes, called “jim crow” laws. these laws made it illegal for blacks and whites to share public facilities. this meant that blacks and whites had to use separate schools, hospitals, libraries, restaurants, hotels, bathrooms, and drinking fountains.

explanation: