Based on the information provided in the audio, a device which Martina needs for her class is: A. a calculator.
What is an inference?
An inference can be defined as a process through which a reader or listener can deduce the meaning and message (information) that is associated with an audio or a literary work, especially through induction.
Based on the information provided in the audio, we can infer and logically conclude that a calculator is the device which Martina needs for her class.
Read more on inference here: brainly.com/question/11496600
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