Sentence fluency refers to the ease with which words and groups of words flow when read or spoken, so the best answer is "Combining sentences to use complex structure" although that's not a great definition.
Answer: B and D
Explanation:
B and D makes sense if it was multiple choice.
A and C doesn't make sense if you read the sentence with the two names and you will see it doesn't make any sense at all.
Romanticism is a method used to reveal the beauty or truth existing in the mankind using words and characters, so your answer would be D. :)