Besides a speaker's reasoning, which factor might affect a person's impression of the arguments in a radio speech?

the background music

the speaker's visual aids

the speaker's appearance

the speaker's height

the background music, the speaker's visual aids, and the speaker's appearance are factors that might affect a person's impression of the arguments in a radio speech. However, the speaker's height is not a factor that typically affects a person's impression of the arguments in a radio speech, as height is not visually conveyed in an audio format.