The best revision of the sentence is C.) Anna tried to hold back the dog, but she was just not strong enough for the bulk, power, and movement of the dog.
Ryan O'Neil: "Strategies for Young Investors," Finance Weekly: August 1, 2009: 33-35. Print.
Ryan O'Neil. "Strategies for Young Investors.” Finance Weekly 1 August 2009: 33-35.
O'Neil, Ryan. "Strategies for Young Investors." Finance Weekly 1 August 2009: 33-35. Print.
O'Neil, Ryan: "Strategies for Young Investors." Finance Weekly August 1, 2009: 33-35.