Explanation
Reading the question: this is a brief, pseudo-syllogistic
argument, so we will use term matching.
The conclusion comes at the
beginning of this argument; "Astrology is a true field of science" is the
opinion that draws on the other facts for support. The improperly matched term
is "true field of science." The most critical assumption is roughly, "A field
that uses scientific methods is a true field of science." That statement or a
variant of it, such as its contrapositive, is what we're expecting as the
answer.
Applying the filter: (C) and (D) both have the right terms
involved. Choice (D) matches our prediction. Choice (C) is the logical
inversion of what we're looking for, so it is not correct.
Logical proof: We can prove choice (D) with the negation
test. Say that employing scientific methods did not make that field of study is true field of science. In that
case, the argument falls apart. Since the negation of (D) destroys the
argument, (D) itself is assumed by the argument. The correct answer is (D).
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