Question

Which of the following groups of words in bold is nonrestrictive and should therefore be set off with commas in the sentence?
A.My yarn which is blue and gray will make a very pretty scarf.
B.Hats knitted by my mother are worn all winter by my family.
C.The person who taught her to knit is my great-aunt.
In "A" its which is blue and gray
In "B" its knitted by my mother
In "C" its who taught her to knit
I think it's B...?

Answer 1

"Non-restrictive" means basically that the phrase or clause is not necessary to the meaning of the sentence. Therefore, I would go with option A.

Answer 2

Thank you