Joining two simple sentences into another simple sentence
Sentence synthesis means combining two or more simple sentences into one new sentence. ...
By using infinitives.
We can combine these two sentences into one using a to-infinitive.
By using a noun or phrase in apposition.
By using a participle.
We can combine two simple sentences into one by using a present or past participle
d primary sources are what the rely on
Expository writing is used to convey factual information (as opposed to creative writing, such as fiction). It is the language of learning and understanding the world around us. If you've ever read an encyclopedia entry, a how-to article on a website, or a chapter in a textbook, then you've encountered examples of expository writing
So a or d but i'm leaning toward d