Ken and Tom are high-school students. They meet each other at a gallery but Ken is in a hurry

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions

Ken and Tom are high-school students. They meet each other at a gallery but Ken is in a hurry.  
Ken: "I’ve got to go, Tom. So long."      
Tom: "So long, Ken. And ________ ."

• A. be careful
• B. take care
• C. don’t hurry
• D. don’t take it seriously