In the given question, four words are given out of which one word is correctly…

Answer: International is the correctly spelt word.

Reason: The word is formed from the prefix inter- (meaning between) and the root national.

• Intirnational: incorrect — the fourth letter should be 'e' (inter-), not 'i'.

• Internationel: incorrect — the ending should be 'al', not 'el'.

• Intirnationel: incorrect — it has both the wrong fourth letter ('i' instead of 'e') and the wrong ending ('el' instead of 'al').

Tip: Remember the parts inter- + national → international.