How do I asked a question then just post the answer in my writing: ill show you an example! please help?

[Futuristic]

So i'm writing this piece, and i put a question in my writing like

What is the cause to all this self-indulgence? Social Media.

i formed it like that, but microsoft word is telling me to rephrase it. idk how?

[Crono]

Well microsoft is looking at grammar, so "social media" isnt a complete sentence, but you can just ignore it. Or you could make a complete sentence.

What is the cause to all this self-indulgence? Social media is the cause to all the self-indulgences.

[LS]

Use of, not to.
Use an exclamation point or a period, though an exclamation point is stronger.
You don't need to capitalize "media" in the term "Social media."

What is the cause of all this self-indulgence? Social media!