Answer: a) The need
Explanation:
Need is determining the requirements that is behind the content of the speech. The subject and cause that is desired to be conveyed is through speech is presented in form of need so that audience can be convinced. Facts are shown as example and statistics so that it can persuade audience.
According to the question, Amira is using need factor for delivering the speech so that severeness and seriousness of drinking issue can be understood by the audience through the requirement of avoiding it.
Other options are incorrect because plan is the scheme that is sued for laying out the content and practicality is giving the feasibility and genuine content to determine speech content.Thus, the correct option is option(a).