Final answer:
The subject of this question is Business. Trina is trading efficiency for cost by having a zoom conversation instead of flying to meet the customer in person.
Step-by-step explanation:
The subject of this question is Business. Trina is trying to save money by utilizing a zoom conversation instead of flying in to meet the customer in person. This trade-off involves considering the different benefits and costs associated with each option.
Her decision to have a zoom conversation instead of flying to meet the customer represents trading Efficiency for Cost. By using technology, she can save on travel expenses and time.