Question

Which sentence below uses commas correctly?

I thought that twelve people had signed up but I could be wrong.
I thought, that twelve people had signed up, but I could be wrong.
None of these sentences are correctly punctuated.
I thought that twelve people had signed up, but I could be wrong.

Answer 1

Answer:
The answer is D
I thought that twelve people had signed up, but I could be wrong.

Answer 2

I guess the answer is

3rd one which is None of these sentences are correctly punctuated ...

Let me know if it's incorrect :-)