A set of eight cards were labeled with A, D, D, I, T, I, O, N. What is the sample space for choosing one card?

A) S = {A, D, D, I, I, N, O, T}
B) S = {A, D, I, T, O, N}
C) S = {A, I, O}
D) S = {D, I}

WILL GIVE BRAINLIEST
PLEASE HURRY