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Rock samples taken from the remains of an asteroid

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Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.
(A) has been dated to be 3.47 billion years old and thus is
(B) has been dated at 3.47 billion years old and thus
(C) have been dated to be 3.47 billion years old and thus are
(D) have been dated as being 3.47 billion years old and thus
(E) have been dated at 3.47 billion years old and thus are

Official Answer

1 Best Answer

perwinsharma
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Best answer

The answer is (E).
But, on the SC questions it is more important to know why the other answers are wrong.
A) has been dated to be 3.47 billion years old and thus is - The subject in the question is Rock Samples (plural) so a plural verb should be used. 'has' is the wrong usage. Also 'dated' must go with 'at' and not 'to be' when we express an age

B) has been dated at 3.47 billion years old and thus - Subject-verb agreement error. It should not be 'has'

C) have been dated to be 3.47 billion years old and thus are - 'dated' must go with 'at' and not 'to be' when we express an age

D) have been dated as being 3.47 billion years old and thus - 'dated' must go with 'at' and not 'as' when we express an age

E) have been dated at 3.47 billion years old and thus are - the correct answer

answered Nov 24, 2015 by Associate (143 points)
selected Nov 26, 2015 by
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