Final answer:
Mr. Ullomi's behavior of losing his temper and experiencing crying spells due to losing his job is an example of regression, where an individual reverts to earlier behaviors as a defense mechanism.
Step-by-step explanation:
Mr. Ullomi's behavior after losing his job, characterized by frequent loss of temper and crying spells, is most clearly an example of regression. Regression is a defense mechanism where an individual faced with stress reverts to a behavior that is characteristic of an earlier stage of development. This could be seen in someone acting much younger than their age in response to a stressful situation or losing an important aspect of their identity, like a long-held job.