Answer:
The correct answers are:
A.) x ∈ B ⋃ C
B.) x ∈ B ∩ C
C.) x ∈ A ⋃ C
x is in the overlap between B and C, so is an element of either and both B and C
x is an element of C, it is also an element of A∪C, since that union includes all elements of A along with all elements of C
