The correct option is D I
Given sequence: R S C I T R S C _____ T
By observing the pattern in the sequence, we divide the sequence in 2 groups, having 5 terms each.
So, the given sequence in the groups from can be written as:
[R S C I T] [R S C _____ T]
As the second group follows the letter arrangement same as the first group, the missing term in the second group of the sequence is I–.