In order to understand this question so well, we have to know or understand how the waves in the brain works or say how EEG with the full meaning -electroencephalographic or electroencephalogram in the brain and this talks about the activities which are electrical in the brain.
If you look at the question very well, we will see that because she has to read for her test Azul is at alert and she is trying to study everything related to the course. This type of brain waves or say brain wave activities is known as the beta wave activity which is the brain wave activity for alertness and when someone is trying to solve a problem.
