|Question 6Verbal

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Text
Chorioactis geaster, a species of mushroom that makes a distinctive hissing sound when it releases its spores, is an elusive fungus that has been observed only in Texas and Oklahoma in the US and in the Miyazaki and Nara Prefectures in Japan. Scientists aren’t entirely sure why C. geaster is distributed in this way (genetic analysis reveals that the US and Japanese strains diverged 19 million years ago), but the mushroom appears to be very selective: it is typically found on the decaying stumps and roots of only a few tree species that are abundant in these areas.
Which choice best describes the function of the underlined portion in the text as a whole?
It provides an explanation for the relationship between C. geaster and its habitats.
A
It highlights the negative impact C. geaster has on the trees on which it’s found.
B
It emphasizes the uncertainty about C. geaster alluded to earlier in the text.
C
It elaborates on a characterization of C. geaster presented earlier in the text.
D