Shake the boxes. Smell the boxes. Listen to the boxes. Weigh the boxes.
I gave my students this multiple choice 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 wetted with vanilla flavoring. Which should they do to get the best information about what is in each box?

Only one answer is correct among these 4 choices:
- Shake the boxes.
- Smell the boxes.
- Listen to the boxes.
- Weigh the boxes.

Could you tell me which one is correct?

Smell the boxes.