The use of the word shockingly in paragraph 1 suggests that the author is surprised that it took so long for astronomers to suggest 53 planets. The correct option is D.
An astronomer is a scientist who studies astronomy and concentrates on a certain issue or field outside the purview of Earth.
The missing paragraph of the question is:
Last year, two colleagues and I announced that we had found an unknown body slightly larger than Pluto in the far reaches of our solar system. Since then, astronomical confusion has reigned on Earth and, depending on whom you ask, our solar system has 8, 9, 10 or, shockingly, 53 planets.
The use of the word shockingly in paragraph 1 suggests that the author is surprised that it took so long for astronomers to suggest 53 planets.
Thus, the correct option is D.
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