Sally published a book of poems in 2019. She collected the sales data for her book from a few bookstores in the years 2019 and 2020 for the months June to December. The graph shows the data she collected.Based on the data displayed in the graph, Sally concluded the sale of her books reduced to nearly half in the year 2020. Is this a valid conclusion?

Select the correct answer.

Yes, because she personally collected the data from the book stores.
No, because the data collected is for only six months.
Yes, the length of the bars for 2020 are almost half of their lengths in 2019.
No, because the relative size of the bars doesn’t represent the actual sales ratios in 2019 and 2020 since the y-axis does not start from 0.