The correct option is D Z∉Y
If any element a belongs to the set X, then we write it as a∈X
While if a does not belongs to the set X, then we write it as a∉X.
Here, we have Y as a set of letters in the word CRICKET.
⇒I∈Y & C∈Y and A∉Y & Z∉Y.
Hence, options I∈Y & Z∉Y are the correct options.