Q Key O Hydrogen atom Oxygen atom Jestion #1: What does the students' model show about the relationship between the numbers of atoms present before and after the reaction? O A. The number of oxygen atoms before the reaction is greater than the number of oxygen atoms after the reaction. O B. The number of hydrogen atoms before the reaction is greater than the number of hydrogen atoms after the reaction. O C. The total number of hydrogen and oxygen atoms before the reaction is equal to the total number of hydrogen and oxygen atoms after the reaction. O D. The total number of hydrogen and oxygen atoms before the reaction is less than the total number of the hydrogen and oxygen atoms after the reaction.​