Here's a problem to solve: Whenever scientists carefully measure any quantity many times, they expect that

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

- A: all of the measurements will be exactly the same
 
- B: only two of the measurements will be exactly the same
 
- C: all but one of the measurements will be exactly the same
 
- D: most of the measurements will be close but not exactly the same
 