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Do you know what union means?
The union of two sets is a set that contains every element that is in one set or in the other set. Write each element only once. Now look at your sets. Create a new set, and start filling it with every element you see in set A or in set B. Do not write an element more than once.
The union has all elements from BOTH sets. You did the intersection. The intersection has the elements that are in common. The union has all of them.
The figure above shows how you start writing the union of the sets. Start by creating a new set and copying all elements from one of the sets. The union already has all elements of set A.
Now look at the elements of set B. If they are different, write them in the union also. If they are already int he union, don't write them again.
The two elements of set B are already in the new union set we started writing, so the union set is done. We can close the bracket and we have finished.
so is b the answer?
Oh Okay thanks for the big help
Since both elements of set B are also elements of set A, set B does not add any new elements to the union of the sets.