|A) S||B) T|
|C) I||D) E|
The given word is VITREOUS. Of which , TRSV are the consonants and IEOU are the vowels. Now, after making the changes as given in the question we get following arrangment: RSTVEIOU.
Again from precalculation, we know that second to the right of fourth from the left means (2+4=) 6th from the left. i.e I