Answer:
“The artist created a series of modern masterpieces” is in active voice.
Step-by-step explanation:
In active voice sentences, the subject does the action.
The people voted for a town curfew.
In passive voice sentences, the subject receives the action.
A town curfew was voted for by the people.
If you can put 'by zombies' at the end of your sentence and it still makes sense, then it is in passive voice. In the example 'by the people' was used instead.