Cognitive Abilities Test (CAT4) Practice Exam 2026 - Free CAT4 Practice Questions and Study Guide

The correct choice is that Chaz uses an instrument inference to understand that his grandma listened to a radio rather than a CD based on her description. Instrument inference refers to the ability to deduce which tools or instruments are being used in a situation based on contextual clues or descriptions.

In this case, if his grandma described listening to a specific type of broadcast or the way the music played (for example, referring to a station or the way the sound carried), those details would suggest the use of a radio instead of a CD player, which operates differently and has distinct characteristics. By interpreting these contextual hints about how the music was accessed or experienced, Chaz can reasonably conclude what instrument was in use.

Contextual inference involves understanding meaning based on the surrounding context but does not specifically target the instruments involved. Causal inference relates to understanding cause-and-effect relationships rather than identifying sources of sound. Structural inference focuses on the arrangement or organization of elements rather than their function. Thus, instrument inference is most relevant to Chaz's reasoning in this scenario.