Which sentence uses supporting evidence to form the best conclusion about a rattlesnake? O A. The rattlesnake cooled off at night by swimming in the cold water, so it is an endotherm. B. The rattlesnake moved rapidly to stay warm when its body temperature dropped, so it is an endotherm. O C. The rattlesnake ate a great deal in order to stay warm, so it is an ectotherm O D. The rattlesnake's body temperature responded quickly to the environment, so it is an ectotherm.​