For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given or underlined in the sentence. To turn over a new leaf

• A. To change completely one's course of action
• B. To shift attention to new problems after having studied the old ones thoroughly
• C. To change the old habits and adopt new ones
• D. To cover up one's fault by wearing new marks

Answer: (C)