Read the following paragraph carefully and select the best topic sentence from the fou

r possible answers that follow the paragraph.

Vending machines sell many different types of items.Some of them sell cold drinks like soda, or hot drinks like coffee or hot chocolate.Others sell candy, stamps, tickets, newspapers, and other types of small merchandise.These machines have been successful for two reasons.They save time and they are convenient.Merchandise sold in machine eliminates the need for a sale clerk or cashier.In many places the customer puts a coin into the machine and then pushes a button, pulls a lever, or opens a door to receive the merchandise.Some machines will also return change to the customer, and a few will make change for paper money.But the basic idea is the same.Customers like to save time and are usually willing to pay a higher price for this convenience.The sale of snacks in vending machines has always been very successful.However, machines now sell hot meals with only limited success.In New York city, automates used to sell a lot of hot foods in vending machines.But in recent years, fast food establishments have replaced automates.()

A.Fast food establishments have always been successful

B.Vending machines have been successful

C.So far, vending machines have won only limited success

D.Vending machines sell many different kinds of goods