I don't believe a or b is the answer so i would eliminate those 2
a person who wrote a book
The correct answer is author’s insights interwoven with facts.
In order to develop an effective body paragraph we need an author's insight that can be represented by a topic sentence, that gives an interpretation of a fact, an idea based on your sources. In well-developed body paragraphs, you have to provide a form of evidence, in a research report would be facts. Not only present them but make sure to interpret them for your readers.
Answer B. (Future perfect tense is used, as the sentence refers to something that will be completed by some point in the future.) is correct.
B is correct because the event which will happen in the future (the baking of the cakes) will also have ended.
I will have baked is a correct form of future perfect, because future perfect is made with the following construction:
Subject + will have + past participle
I could eat a horse I believe is the Hyberbole in this