D ) A topic is needed to complete this sentence. In D ) , “casein” is the subject of the sentence, even though followed by a noun phrase enclosed in commas that additional identifies the subject. I disagree using this type of worry for two explanations. To start with, present https://pay-someone-to-write-my-t14893.thezenweb.com/the-best-side-of-hire-someone-to-write-toefl-essay-for-me-64944957