How many such pairs of letters are there in the word CONSTRUCTION each of which has as many letters between them in the word as there are between them in the English alphabets?

How many such pairs of letters are there in the word CONSTRUCTION each

1.	How many such pairs of letters are there in the word CONSTRUCTION each of which has as many letters between them in the word as there are between them in the English alphabets?
A.	3
B.	4
C.	5
D.	6
E.	None of these
Answer» D. 6