Answer :
A. is wrong because there should be a comma after 'Well'.
B. is wrong because there should be a comma after 'oh'.
C. is wrong because there should be a comma after 'yes'.
D. is correct because the it uses the comma correctly.
D. Why, the tiny shrew is more ferocious than a tiger!
Hope this helps. :)
Its D number one cause all of them don't have any commas accept D. number two u can see by the word Why there's a comma......Hope this helps :)