9. 9. In paragraph 2 of the passage, there is a missing sentence. The paragraph is repeated
below and shows four letters (A, B, C, and D) that indicate where the following sentence
could be added.
Thus, scientists had information about the shape of the domes but not about their
chemical composition and origin.
Where would the sentence best fit?
(A) Another task for the Glomar Challenger’s scientists was to try to determine the origin of
the domelike masses buried deep beneath the Mediterranean seafloor. (B) These structures
had been detected years earlier by echo-sounding instruments, but they had never been
penetrated in the course of drilling. (C) Were they salt domes such as are common along the
United States Gulf Coast, and if so, why should there have been so much solid crystalline salt
beneath the floor of the Mediterranean? (D)