<p>Could you explain why these are right? These questions are from the PSAT pracatice booklet.</p>
<p>Although discoveries of precious gems have brought considerable attention to the country of Sri Lanka, their economy is still based on farming rather than mining. No error.</p>
<p>Answer is C.</p>
<p>Unlike commercial broadcasting, producers working for public television are not primarily interested in reaching the widest possible audience. No error.</p>
<p>Answer is A.
What is wrong with A? It looks correct.</p>
<p>The error in this sentence occurs at (C), where there is noun-pronoun disagreement. The plural pronoun "their" is improperly used to refer to the singular noun phrase "the country of Sri Lanka."</p>
<p>There is no error at (A). The plural verb "have brought" agrees with its plural subject, "discoveries."</p>
<p>There is no error at (B). The noun "attention" is idiomatically used as the direct object of the verb "brought," and the preposition "to" is idiomatically used to introduce the indirect object of the same verb.</p>
<p>There is no error at (D). The preposition "on" idiomatically complements the verb "is . . . based."
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<p>The error in this sentence occurs at (A), where there is an illogical comparison. Producers of public television are illogically compared with commercial broadcasting rather than with producers of commercial broadcasting.</p>
<p>There is no error at (B). The participle "working" is properly placed after the noun it modifies ("producers") and is itself properly modified by a phrase that begins with the preposition "for."</p>
<p>There is no error at (C). The preposition "in" with a gerund ("reaching") as its object idiomatically modifies the adjective "interested."</p>
<p>There is no error at (D). The superlative adjective "widest" appropriately modifies the noun phrase "possible audience."