A is the answer because the sentence is obviously asking the reader if they can identify Beethoven's style.
B cannot be the answer because the sentence uses the question word "can"
C cannot be the answer because, again, the sentence is asking a question.
D cannot be the answer because the sentence is not giving a command, but asking a question.
The correct answer seems to be number four - not enough. It both suits grammatically, and sentence-wisely.
Try death stranding........
In your following sentance you can use "began"
