Explanation:
relative clause
it modifies noun phrase by some grammatical tools
example
my friend who is coming from America is coming to the dinner
here who is used to indicate the noun phrase
subject verb agreement
A subject and a verb must agree, even when other words or phrases come between them.
example
The flock of geese is flying south for the winter.
The subject is flock, so the verb should be is flying.
B, A person who is obsessed with themselves
The correct answer is C. Jaye, who has three dogs, just adopted a puppy from the shelter.
Explanation:
A non-restrictive modifier is a clause or phrase that describes a noun. Additionally, this differs from other modifiers because this is not essential. This implies the modifier is enclosed by commas and can be deleted without making the sentence incomplete.
In this context, the only option that includes a correctly punctuated non-restrictive modifier is "Jaye, who has three dogs, just adopted a puppy from the shelter" because the section "who has three dogs" describes the noun "Jaye", this modifier can be omitted, which means it is not essential and it is enclosed by commas.
