First off, you can rule out B and C. They simply do not make sense. Between A and D, it seems that D has a misplaced modifier by saying "in a tiny sip." a "tiny sip" is being used as a noun here. Therefore, the correct answer to your question is A. Taking a tiny sip, the chef tasted the soup. Hope this helped! (although I think there is better ways this sentence could be written)
