The Reason That Most Extrasolar Planets Discovered by the Transit

Multiple Choice

The reason that most extrasolar planets discovered by the transit technique are found close to their parent stars is

A) planets that are close to a star are heated up and therefore larger.
B) more of the starlight is blocked by the planet when it transits the star.
C) they transit more frequently, and have thus been more likely to be detected in the short time we have been searching for them.
D) the closer to a star, the hotter and therefore brighter the planet is.
E) the wavelength shift of the star's spectrum is larger.