Question 21 is based on the passage you have just heard.

 According to Charles Happer, Chairman of CanAgra, the Healthy Choice line of frozen dinners, began with his own heart attack. It’s been brought on by years of eating anything he could get his hands on. (19) As he’s lying in hospital, recovering, Happer imagined a line of healthy frozen foods, the Tasty Good. (20) The Healthy Choice product line was carefully tested with consumers before being introduced to the general public. CanAgra’s research and development staff spent a year working under the instruction—“Whatever the cost, don’t sacrifice taste”. The first test market results surprised even the CanAgra team: the low sodium low fat frozen dinners sold much better than expected. According to the firm’s vice president of marketing and sales, (21) we benefited from low expectations. The products were much better than people thought they would be. This finding supported CanAgra’s decision to position a product against other high quality frozen dinners, rather than as a diet or health food. The new product’s brand’s name and packaging were an important part of the development process. (22)The name Healthy Choice was chosen for the positive implication it held for consumers. Because CanAgra felt the product would be an impulse purchase, it was important to make the item stand out in a freezer case. This was accomplished through the dark green packaging that not only differed from the competitors, but also suggested freshness and richness in vitamins.

(21). What is said to contribute to CanAgra’s business success?

解析：原文中提到，他们的商品一经走向市场，就比预期的要卖的好得多。后来市场营销部副总裁将他们的成功归因于了他们产品的低期望值，因为很多客户买了之后都发现比他们想象中的要好的多，所以产品大卖。故答案选B。