A. Because people were unable to understand signs, signals, and symbols.
B. Because people wanted to communicate across long distances.
C. Because people believed that signs, signals, and symbols were obsolete.
D. Because people wanted new forms of communication.
Đáp án : B
Từ dòng 3 đoạn cuối: means of communication intended to be used for long distances and extended periods must be based upon speech. To radio, television, and the telephone, one must add fax, paging systems, electronic mail, and the Internet
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