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The author of the passage is primarily concerned with
This answer choice is too broad/general. The passage does not discuss the De Beers diamond cartel in general but uses it as an example of how advertising affects business success.
This answer choice is too broad/general. The passage focuses on a particular example of advertising: the diamond business.
This answer choice is too narrow/specific. The idea of diamonds as an expression of love is the topic of the second paragraph and not the entire passage.
This answer choice is too narrow/specific. The scarcity of diamonds is a detail mentioned in the first paragraph and is not the main idea of the passage.
We know from the first paragraph that the passage discusses the effect, or impact, of advertising on business, and from the second paragraph that it discusses the specific case of the diamond industry.