Here's a problem to solve: The element krypton is a gas that shows almost no chemical activity. To find another element with similar properties, what should a student look for on the Periodic Table of the Elements?

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

- A: an element in the same group
 
- B: an element in the same period
 
- C: an element with the same net charge
 
- D: an element with the same atomic mass
 