To estimate the number of COVID-19 cases in the UK on day 20 using the described graph, we would need to look at the y-coordinate that corresponds to day 20 on the x-axis. Since I do not have access to the image to visualize the actual data points and the fitted exponential line, I can't specify the exact number of cases for day 20.
However, if you can access the graph, you should find the location of day 20 on the x-axis and see where it intersects with the exponential fit line. The y-coordinate at that intersection will give you the best estimate of the total number of COVID-19 cases on that day.
If you identify the appropriate y-coordinate corresponding to day 20, choose the response closest to that value from the options provided. Typically, such graphs show an increasing trend, so it is likely to be between the options you have, depending on the growth in cases around that time.
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