Answer:
Marcus is an audio-oriented learner.
Step-by-step explanation:
Audio learning is one of the learning methods classified in the VAK model of learning. This model classifies three modes of learning visual, audio, and Kinesthetic.
In auditory learning, the listeners are able to retain more information if is a combination of sound and speech. An auditory learner is a good listener also.
In the given case, Marcus who is able to pick up main ideas from the teacher's lecture can be classified as an audio-oriented learner. As he is able to retain information from the lecture.
So, the correct answer is Marcus is an audio-oriented learner.