How many meaningful English words can be formed using first, third, sixth and seventhletters of the word RECOGNIZE (when counted from left to right) using all the letters buteach letter only once in each word?

Given Word:  RECOGNIZE

The first letter is R.
The third letter is C.
The sixth letter is N.
The seventh letter is I.
We now have the letters R, C, N, I.
Meaningful English words using these letters:
R, C, N, I can be rearranged to form the word "CIRN", but it is not a meaningful word.
Another possible rearrangement is "RINC", but it is also not a meaningful word.
None of the possible combinations form a valid, meaningful English word.
Therefore, No meaningful English words can be formed using these letters.

Thus, the correct option is (a) NONE.