A small-business owner collected data from a random sample on the amount spent on an order and the time it takes to fill the order. The resulting data were used to complete a linear regression analysis of time, in minutes, versus amount spent, in dollars, and to create the following residual plot.

Based on the residual plot, which condition for inference for the slope of the regression line does not appear to be satisfied?

A. The true relationship between the number of items and the amount spent on an order is linear.
B. For each amount spent on an order, the distribution of time to fill the order is approximately normal.
C. The standard deviation of the distribution of time to fill an order is the same for each amount spent on the order.
D. The data are collected using a random sample or randomized experiment.
E. The sample size is less than 10% of the population size.