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解析:A: in today’s increasingly-competitive market product diversification is crucial to the success of a business. Today’s market is becoming more and more diversified which means a single range of products produced by a certain company cannot survive since the competition is extremely high. And even if you survive you will find your earnings via a single product won’t cover even a small fraction of your cost. Therefore a business should diversify its product range. A diversified product range will make you avoid the tense competition in the specific area and give you more opportunities to open up more potential markets which will reduce to a large extent the risks due to the high competition.
(还可从吸引顾客的角度来说)