UPS's price increases were occurring during the Covid-19 pandemic. Why did that fact make it more difficult to determine the elasticity of demand for UPS's delivery services during this time period? A. Shoppers were using delivery services more than they usually would to avoid contracting the Covid-19 virus at stores. B. Many retailers were closed and could not offer delivery to their customers. C. Because fewer people were driving during the pandemic, gasoline prices declined during this time period as well. D. The holiday season is when many people increase their consumption