Final answer:
Morton is most likely a kinesthetic learner, as he understands and retains information best through physical activities and hands-on experiences(option c).
Step-by-step explanation:
Based on the description of Morton's learning preferences—actively doing things to retain and understand information, enjoying group work, and struggling with passive learning environments such as lectures—it appears that Morton is most likely c) A kinesthetic learner. Kinesthetic learners typically learn best through motion and doing physical activities. They typically prefer hands-on experiences, experiments, and activities that allow them to manipulate materials or simulate concepts. This mode of learning can be contrasted with visual learners, who understand and remember things best by seeing pictures, diagrams, or reading notes, and auditory learners, who benefit from listening to explanations, lectures, and discussions.