The correct answer is B) nausea and dizziness. The symptoms of seasickness typically include nausea, dizziness, and disorientation. This is due to the body's inability to reconcile the conflicting visual and vestibular cues experienced on a moving vessel. Reddening of skin and hives (A), fever and thirst (C), and stomach cramps and diarrhea (D) are not the primary symptoms associated with seasickness. The nausea and dizziness experienced during seasickness are the key indicators that differentiate it from other types of illness or discomfort.