Here's a problem to solve: A scientist on a field trip discovered a new organism. She examined its cells under a microscope and observed several different structures, including a nucleus, a cell wall, and some chloroplasts. This organism would correctly be classified in which of the following kingdoms?

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

- A: Animalia
 
- B: Monera
 
- C: Plantae
 
- D: Fungi
 