Answer:
2. Begin with a grid divided into squares.
Step-by-step explanation:
This is a best approach because it allows for accuracy/precision. To successfully indicate the increase in customer satisfaction on a line chart, before anything else having grid divided into squares makes it easy for her to setup her scale for the two months customer satisfaction data.
After completing this phase, then she could proceed further with the drawing of line chart; which should indicate the rate of change in customer satisfaction on the vertical axis.