Answer: the best option to describe the location of electrons in the moder atomic model is letter C, "within an electron cloud"
Step-by-step explanation:
The question requires us to choose the best option to describe how the modern atomic model describes the location of electrons in an atom.
The modern atomic model states that the atom is formed by a dense nucleus containing protons and neutrons and a "cloud" surrounding this nucleus, where the electrons are spread over. The distribution of electrons on the "cloud" is determined by a set of principles described by Quantum Mechanics. In other words, we can say that, according to the moder atomic model, electrons occupy certain regions of space, around the nucleus, that are called orbitals.
Therefore, the best option to describe the location of electrons in the moder atomic model is letter C, "within an electron cloud".