There are no option listed, however, I could still help you.
If your options look like the following, then that would be the correct answer.
→ Having no commas.
→ When the sentence would be squished in together, and they would have no pausing when reading through the sentence.
→ And also, when the sentence would contain a "subordinate clause or clauses."
These would be the 3 ways you would be able to tell if the sentence would have a complex sentence.
I hope this was found helpful.
