I need help understanding this problem thank you very much it is a practice test. I have problems understanding it thank you.

8. Classify each of the following statements as a definition, postulate, conjecture, or theorem. A. The measure of an exterior angle of a triangle is equal to the sum of the measures of the two nonadjacent interior angles. B. The product of an even number of negative factors is positive. C. A point is equidistant from two figures when it is the same distance from each figure. D. If there is a line and a point not on the line, then there is exactly one line through the point perpendicular to the given line