ACCORDING TO THE PASSAGE, SCIENTISTS USED ISOTOPES FROM THE WATER...

46. According to the passage, scientists used isotopes from the water of the ice core todetermine which of following?A. The amount of air that had bubbled to the surface since the ice had formedB. The temperature of the atmosphere when the ice was formedC. The date at which water had become locked in the glacierD. The rate at which water had been frozen in the glacier