From the last sentence of this passage we conclude that _____.

A. businesses usually do not pay much for advertisement
B. businesses know well that advertisement could bring profits
C. advertisement could hardly convince people of the value of the goods
D. advertisement usually costs businesses large amounts of money
A. businesses usually do not pay much for advertisement
B. businesses know well that advertisement could bring profits
C. advertisement could hardly convince people of the value of the goods
D. advertisement usually costs businesses large amounts of money

【答案】