The correct answer is B.
The first two sentences are establishing characteristic shared by both petroleum and coal. The word "however" is used to contrast the similarities already presented with the differences that will be stated in the following sentences.
Answer:
A
Explanation:
Oberon and Titania
Lysander and Hermia
Demetrius and Helena
These were the pairs at the end of the story.
Hope it helps and is correct!
my friend
google it