Final answer:
The pattern described by Yumiko seems to be an b. exponential relationship.
Step-by-step explanation:
The pattern described by Yumiko seems to be an exponential relationship. In an exponential relationship, the output values increase or decrease rapidly as the input values change.
A common example of exponential growth is population growth, where the number of individuals increases exponentially over time.
In Yumiko's case, it is important to analyze the specific data and how the output values change with respect to the input values to confirm if it is truly an exponential relationship.