Answer: a. share of customer
Step-by-step explanation:
Share of Customer refers to the proportion of the total amount that a company gets out of money that a customer will spend in a certain category.
In other words, a company that has a greater share of customer from a particular customer will see that customer spend more of their money on them.
Share of Customer is improved by excellent working relationships with customers such that they will be loyal to you. Darlene should therefore strive for this so that their customers who are planning on more expansion will keep coming back to Darlene's company and spending more and more on them.