The correct option is B Y={x:x<10 & x∈W}
We have Y is a set of all whole numbers x such that x<10.
In roster form, we can express it as: Y={0,1,2,3,⋯,9}
So, in set builder form, we can write it as:
Y={x:x<10 & x∈W}, where W denotes the set of "Whole Numbers".