If we form a four-letter meaningful word with the 1st, 2nd, 3rd, and 5th letters from the left end of the word 'TEACHING' (using each letter only once), then what would be the third letter of that meaningful word? If no meaningful word is formed, then mark the answer as Y. If more than one meaningful word is formed, then mark the answer as W.

To determine the correct third letter, let us analyze the letters of the given word step-by-step.

Step 1: Identify the specified letters from the word 'TEACHING'.

Let us write down the positions of all letters from the left end of the word TEACHING:

• 1st letter = T
• 2nd letter = E
• 3rd letter = A
• 4th letter = C
• 5th letter = H
• 6th letter = I
• 7th letter = N
• 8th letter = G

Step 2: Extract the letters to form a word.

The 1st, 2nd, 3rd, and 5th letters extracted are T, E, A, and H.

Step 3: Form meaningful four-letter words using T, E, A, H (each exactly once).

Arranging these four letters gives the valid English word: HATE.

Checking for any other valid words: no other standard 4-letter English word can be formed using each of these letters only once.

Step 4: Find the third letter of the meaningful word.

In the word HATE:
• 1st letter = H
• 2nd letter = A
• 3rd letter = T
• 4th letter = E

Therefore, the third letter of the meaningful word is T.

The correct option is T.