refusing to be persuaded or to change one's mind.
Does<span> not </span>do<span> away with all the article problems, but it reduces ... </span>This excerpt<span> contains nine errors in article and singular/plural noun </span>uses<span>.</span>
I believe that sentence 2 is the correct answer.
The ball, that was yellow and made of rubber, bounced down the road.
Our clause is : "that was yellow and made of rubber." This describes the features of the ball, which is the noun. Adjectives describes nouns therefore this sentence would be the correct answer!