What passage specifically? There’s no picture so we won’t be able to help you
The correct option is this: I LOVE DISCUSSING BOOKS WITH WHOEVER LIKES TO READ MYSTERIES AND SCIENCE FICTION.
An adjective is a part of speech that describes, quantifies or identify a noun or pronoun. An adjective gives more information about a noun. In the correct option given above, the adjective 'whoever' describes the kind of person that the speaker likes to discuss books with.
Yes, this is a run-on sentence. It should be changed to - "My favorite furniture company offers more than one hundred different fabrics. You can order free fabric swatches to see what looks best with your decor."
It is D because it shows you how to describe just Trust me