Correct option is D
The correctly spelt word is (d) simultaneous.
- Correct word: simultaneous means happening at the same time. (Hindi meaning: एक साथ / समकालिक)
- Example: There were simultaneous announcements in several cities.
Why other options are incorrect:
- (a) simulteaneous: incorrect letter placement and extra vowel.
- (b) simultenaous: incorrect spelling of the middle syllable.
- (c) simulteneous: incorrect vowel sequence.
So the correct answer is (d)