Which sentence contains a shift in voice?

Responses I threw the ball to my dog and he chased it. I threw the ball to my dog and he chased it. - no response given They went to the ceremony and were given an award. They went to the ceremony and were given an award. - no response given She picked the flowers and gave them to her friend. She picked the flowers and gave them to her friend. - no response given I enjoy eating donuts more than I should.

I enjoy eating donuts more than I should.