The word conspicuous comes from the Latin words "con-" and "-spicire" meaning to look at. And became the word "conspicere" meaning to look at attentively. Then to a Latin word "conspicuus" meaning striking or visible. Therefore, the meaning of conspicuous is to stand out, to be visible or in short, attractive.
The most appropriate thesis sentence would be: "As we got older our lives went in different directions, but we still keep up on social media" (D).
In a good thesis sentence, your reader should:
- identify a key question or idea,
- be able to understand how you are going to develop this idea in the paper,
- and be given a hint of what your conclusion will be.
This sentence (D) is raising a key question: how did the friendship evolve as you got older? It is also providing a direction regarding the way you are going to approach the development (chronologically). Finally, it mentions the conclusion, or the answer to the question, in a few words: "we still keep up on social media."
I can cross out the first and last one and between the two left I think it’s the one about the friendship because the flashback includes that they were friends when younger and the person with illness only had that one friend which in my opinion adds mystery about the friendship. So basically the 3rd one about friendship.