Study the graphs. Identify the graph that best represents the trend in alkene boiling point as a function of carbon chain length.

4 graphs with number of carbons in a chain on the horizontal axis and boiling point on the vertical axis. A. A line starts near the origin and rises steadily. B. A line starts high on the vertical axis and falls steadily. C. A line starts near the origin and rises and falls in a parabola. D. A line starts high on the vertical axis and curves down toward the origin before leveling out near the horizontal axis.