|Question 19Verbal

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Text
The small celestial body known as 2010 BL4 is expected to have a relatively short lifetime in the outer solar system. Within just a few million years, 2010 BL4 is likely to migrate into the inner solar system or be destroyed, according to ________ trajectory.
Which choice completes the text so that it conforms to the conventions of Standard English?
astronomers modeling of the objects
A
astronomer's modeling of the object's
B
astronomers' modeling of the object's
C
astronomers modeling of the object's
D