How many meaningful four-letter English words can be formed using the second, third, fifth and seventh letters of the word TOURIST (when counted from left to right) using each letter only once in each word.

Correct option is A

The word given is TOURIST. Let's identify the required letters:
· Second letter: O
· Third letter: U
· Fifth letter: I
· Seventh letter: T
The letters we have are O, U, I, T.
From the above word no meaningful word can be formed.