Hello, Guys! Here is the question of mine: Is “David, who scored 500 goals, is a good player.” a definite relative clause?

It is a "non-defining relative clause."

Explanation:

When it comes to differentiating a defining relative clauses from a non-defining relative clause, it is important to consider whether the clause is "essential" or "not essential" to the meaning of the whole sentence.

If it is essential or extremely important, then it's a defining relative clause while if it's not essential, it's a non-defining relative clause.

In the sentence, "David, who scored 500 goals, is a good player." The clause here is "who scored 500 goals." If you remove this clause, the sentence goes like this: "David is a good player." This sentence still makes sense even if the clause was removed. Thus, it is a non-defining relative clause.

B. 3

Explanation:

In order for the sentence to have five people in the committee, "I think Robert Mary Jane Andrea Lee Ann and Milton should be on the planning committee" will have to be made into "I think Robert, Mary Jane, Andrea Lee, Ann and Milton should be on the planning committee" or anyway by adding three commas within the names. The positioning of the commas can be anywhere within the names but only as far as correct names can be obtained.