Final answer:
None of the given choices inherently slow down evolution. Factors like rapid environmental change, rapid immigration, and short generation times generally contribute to the speed of evolutionary changes.
Step-by-step explanation:
The question asks which of the listed factors would slow down the process of evolution. The correct answer is none of the given choices slow down evolution. Tendency toward chromosome breakage can lead to mutations which can both increase variation upon which natural selection can act and lead to disorders that may negatively affect an organism's chances of reproduction; thus, it does not inherently slow evolution.
Rapid environmental change can force species to adapt quickly, potentially speeding up evolution. Rapid immigration introduces new genetic material to a population, which can increase genetic diversity and potentially accelerate evolution through increased gene flow. A short generation time means that more generations can occur in a shorter period, which can allow for faster accumulation of evolutionary changes. Overall, all these factors except chromosome breakage generally contribute to the speed of evolutionary processes rather than slowing it down.