Here's a problem to solve: A scientist studied the number of eggs a species of bird lays each year. He found that the most common number of eggs laid in a year is three. Which statistical measurement did the scientist find?

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

- A: the mean number of eggs laid in a year
 
- B: the median number of eggs laid in a year
 
- C: the mode of the number of eggs laid in a year
 
- D: the range of the number of eggs laid in a year
 