Which of These Characteristics of the Extrasolar Planets That Have

Multiple Choice

Which of these characteristics of the extrasolar planets that have so far been discovered surprised astronomers?

A) More than half of the extrasolar planets have strong lines of molecular oxygen in their spectra, a possible indication of life on these planets.
B) The majority of the extrasolar planets rotate much faster than the planets in our solar system.
C) Many of the extrasolar planets are giant planets like Jupiter, orbiting at distances characteristic of terrestrial planets like Earth, where giant planets were not believed to be able to form.
D) Many of the extrasolar planets are terrestrial planets like Earth, orbiting at distances characteristic of giant planets like Jupiter, where terrestrial planets were not believed to be able to form.