An oceanographer is studying the feeding patterns of sharks hunting fish in the Atlantic Ocean. The shark is traveling 5.5 m/s in a northeast direction for 30 seconds before turning and following the fish at 4.0 m/s in the southwest direction for 20 seconds. Which statement could the oceanographer use to best describe the shark's motion?

A The shark experienced balanced forces by changing its speed from 5.5 m/s to 4.0 m/s after turning.

B The shark experienced unbalanced forces by maintaining a speed of 5.5 m/s for 30 seconds.

C The shark experienced balanced forces in the form of acceleration, change in speed, and change in direction.

D The shark experienced unbalanced forces in the form of acceleration, change in speed, and change in direction.