The textbook is used by the students to learn important new concepts. Which answer appropriately revises the sentence to use active voice? a. The textbook, a means to learn new concepts, is used by the students. b. The textbook is used to learn important new concepts by the students. c. The textbook is used by the students to learn important new concepts. check d. The students used the textbook to learn important new concepts. Explanation: The correct answer is D since the students are actively using the textbook. Active verb tense is constructed by the subject performing the action instead of the action performed upon the subject. Active voice is clearer for readers. All other answer choices are in the passive voice