At the sight of a spider, phobic individuals may experience an extreme rush of fear, a racing heart, nausea, sweating, and then often flee with urgency.

A. sweating, and then often flee with urgency
B. sweating, and then they will often urgently flee
C. sweating, and then, often, an urge to flee
D. sweating; they often then have an urge to flee
E. sweating; this is then often accompanied by an urge to flee

OA is C

But I have a question here. the sentence is presenting the series of actions....a racing heart, nausea, sweating....shouldn't there be "and" after the last action(sweating)...