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Read the following passages and answer the questions that follow them, by choosing the correct options.

In this modern age, man has grown to be heavily dependent on computers to carry out all kinds of jobs that were done manually before. In banking for example, computers allow for millions of transactions to be carried out involving large sums of money. The same task would otherwise require thousands of bank tellers. Computers do the job in a much shorter time. They do this practically free of any errors. Computers are responsible for air traffic control and the running of trains. They ensure that travel is made as smooth as possible. In factories nowadays, computers operate mechanical devices that produce goods we require for everyday living. They do so in such quantities that would otherwise be impossible to achieve if these factories were run by humans alone.

Transactions involving large sums of money can be done by

A)  only one man.  

B)  thousands of computers together.

C)  only one thousand men.

D)  thousands of bank tellers.