Answer:
a.Helena vs.Hermia, Demetrius vs. Lysander is answer.
Explanation:
I hope it's helpful!
There are no bolded words available for viewing in this website but I will answer your question correctly. The sentence is very simple, it consists of a simple noun and a simple adjective.
The noun in the sentence is: coral reef
The adjective in the sentence is: very beautiful
Therefore, the answer is that very beautiful directly describes the word of coral reef.
He probably uses a metaphor because a simile uses the words like and as and a metaphor does not use the words like and as. Hope this helps!