Answer:
C: The first sentence uses passive voice, but would be better written in active voice.
Step-by-step explanation:
The first sentence "A new ift shop was opened by the Millers" is in the passive voice, which places more importance in the "new gift shop", and makes this phrase the subject of the sentence. The sentence writtten in the active voice would be more direct and clear, showing who opened the 'shop'. The rest of the sentences are arbout the subject. "The Millers opened a new gift shop..."