Try to make a meaningful word from the first, fourth ,fifth, sixth, seventh and eighth letters of the word RADIOTELEPHONE using each letter only once. If no meaningful word can be made, your answer is 'X' . But if a meaningful word can be made, try to make another word with the second, fourth and sixth letters of this meaningful word. If no meaningful three-letter word can be obtained thus, your answer is 'Y' if more than one word can be made, your answer is and if only one word can be obtained, your answer is the middle letter of that word.
1) X
2) Y
3) Z
4) O
5) none of these

Explanation

4