1) Which situation results in a net sum of zero?
A. Phoenix's morning temperature rose 12.3°F, and then the temperature rose 12 16 °F.
B. James earns $82.30 delivering pizza and then spends $82.30 on his lunch.
C. A dolphin starts at 3.4 feet below sea level and then dives up 34 feet.
D. Simon's average in history is 79.03 and then he raises his average by 79.03 points.
