Please choose the correct answer to the question: Mrs. Henderson's class has five small, covered boxes. One contains perfume; another contains dried onions. There is also a box of pine needles, a box of lemon pieces, and a box with a paper towel wet with vanilla flavoring. Which should they do to get the best information about what is in each box?

Answer1: Shake the boxes. Answer2: Smell the boxes. Answer3: Listen to the boxes. Answer4: Weigh the boxes.

Answer format: answer1/answer2/answer3/answer4
Answer: answer2