The people a speech is aimed at are known as the audience. Thus the correct answer is A.
Speech refers to the art of public speaking where the thought is communicated to an individual or group of people. The objective of speech is to influence people about the subject.
The speech is designed to aim at an audience who listens to the cause and effects of the subject. It is the audience who responds to the speech and connects with it.
Therefore, option A is appropriate.
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