Answer
Working assigned problems (b.) and reading the assignment before a lecture (d.) will help you learn chemistry.
Work Step by Step
As you read and practice problem solving, you remain actively involved in studying, which enhances the learning process. The time you spend in a lecture is also a useful learning time. By keeping track of the class schedule and reading the assigned material before a lecture, you become aware of the new terms and concepts you need to learn. Some questions that occur during your reading may be answered during the lecture. If not, you can ask your professor for further clarification.
