Answer :
According to given sentence, a method of engaging in class is include option A: Reviewing the syllabus.
What is engaging in class?
An engaging in class or learning is defined as the act or procedure in which the students of every class take participate in every learning activities.
Moreover, a syllabus is basically serves as a semester- or quarter-long reminder about every detail that students need to complete or learn with the help of teacher.
Adding to it, students need to review or analysis each and every subject in order to get higher skills and knowledge. In order to compete with other students this engaging skill is required.
The other options like B, C and D do not include under the section of engaging in class because if the student pretend themselves as a good listener that does not mean he/she keen interest in every subject.
Therefore, correct option is A.
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