答案：C

解析：

The slope of the line containing the points (0,0) and (12,8) is 8/12, or 2/3. If (x,y) is another point on this line segment, then x and y must satisfy y/x = 2/3, or y = (2/3)*x. Of the five choices, (3,2) is the only point for which y = (2/3)*x.