This Figure Shows the Orbital Periods and Radii of All

Multiple Choice

This figure shows the orbital periods and radii of all planet candidates identified from Kepler data as of early 2013. Which of the following size planets were most detected?

A) planets less than 1 Earth radius in size
B) planets greater than 10 Earth radii in size
C) planets between 1 Earth radius and 4 Earth radii in size
D) planets between 4 Earth radii and 10 Earth radii in size