Final answer:
The number 2,500 in scientific notation is 2.5 x 10³.
Step-by-step explanation:
To write a number in scientific notation, we express it as a product of a number between 1 and 10 and a power of 10. The given number 2,500 can be written as 2.5 x 10³.
Option C: 2.5 x 10³ is the correct answer.