Which answer choice correctly describes why larger atoms tend to break apart?

The number of neutrons in the nuclei of larger atoms is equal to the number of protons, which makes these atoms less stable.
The proportion of protons and neutrons in the nuclei of larger atoms is generally less even, which makes these atoms less stable.
The number of protons in the nuclei of larger atoms is much higher than the number of neutrons, which makes these atoms less stable.
The proportion of protons and electrons in larger atoms is generally not equal, so the atoms have a charge imbalance and less stability.

I think its c?

there is a proton/neutron disparity, but it is the opposite of c

uranium ... atomic number 92
... mass numbers in the 235 range

b looks better

That's correct! Choice C correctly describes why larger atoms tend to break apart. Larger atoms have a higher number of protons in their nuclei compared to the number of neutrons. This imbalance of protons and neutrons makes the atom less stable and more likely to undergo radioactive decay or break apart. As the size of the nucleus increases, the repulsive forces between protons become stronger, causing the atom's overall stability to decrease. Therefore, it is more likely for larger atoms to break apart or decay in order to achieve a more stable configuration.