Here's a problem to solve: Students have a rock sample that may contain the mineral hematite. They know that hematite has a red or rusty streak. How can the students determine the color of the streak in the rock sample?

Among the 4 following options, which is the correct answer?

- A: use a rock with the known mineral to strike the sample
 
- B: rub the sample on a piece of unglazed clay tile
 
- C: use a file to break off a piece of the sample
 
- D: scratch the sample with an iron nail
 