Which situation is an example of opposite quantities combining to make 0?

A gift card had a balance of $20. Then, all $20 on the gift card was spent.

B A swimmer was 6 feet below the surface of the water. Then she descended another 6 feet.

C A container had 2.1 ounces of liquid. Then, 2.1 ounces of liquid was added to the container.

D The temperature was -5 degrees Fahrenheit. Then, the temperature decreased by 5 degrees

Abilliard ball is struck by a cue. it travels 1 0 0 cm 100cm before ricocheting off a rail and traveling another 1 2 0 cm 120cm into a corner pocket. the angle between the path as the ball approaches the rail and the path after it strikes the rail is 4 5 ∘ 45 ∘ . how far is the corner pocket from where the cue initially struck the ball? do not round during your calculations. round your final answer to the nearest centimeter.