Answer: It contains a strong verb and precise adjective.
Explanation:
Instead of describing the meadow as simply 'beautiful', the second sentence uses a strong verb: to burst, which makes the text more engaging. Furthermore, 'beautiful' is not enough, so in the second sentence, there´s a more precise adjective: sparkling. In addition to the references to the human senses (color and fragrance), these elements make the second sentence to be more interesting than the first.
The answer is C because the relative pronoun "that" is connecting "friend" to a clause. A relative pronoun connects nouns (friend) to phrases or clauses.