The correct answer is B. Simultaneous.
The word "simultaneous" means happening at the same time. It is derived from the Latin word "simul", meaning "at the same time", and "tempus", meaning "time".
The other options are incorrect because they are not spelled correctly. The word "simaltanious" is missing the "u" in the middle. The word "simultanious" is missing the "e" at the end. The word "Simaltaneous" is missing the first "s".
I hope this helps!
