Please help!! https://screenshots.firefox.com/6Jzwnh0vom0aNeZP/www.usatestprep.com

Both a graph of the data as well as a table with some data values and summary statistics are shown.

The researches feel that the additive is effective if at least 75% of the cars had better mileage with the additive.

Was the additive effective and why?
A) Yes, since the IQR is 3 that means 50% of the cars had an increase in the number of miles traveled.
B) No, since the lowest value is -15, there are some cars that did not increase the distance traveled.
C) No, since you have some negative values that means the additive was not effective for some of the cars.
D) Yes, since Q1 is 1 that means only 25% of the data had less than a 1 mile increase in distance traveled.

Question

Please help!! https://screenshots.firefox.com/6Jzwnh0vom0aNeZP/www.usatestprep.com

Both a graph of the data as well as a table with some data values and summary statistics are shown.

The researches feel that the additive is effective if at least 75% of the cars had better mileage with the additive.

Was the additive effective and why?
 A) Yes, since the IQR is 3 that means 50% of the cars had an increase in the number of miles traveled. 
 B) No, since the lowest value is -15, there are some cars that did not increase the distance traveled. 
 C) No, since you have some negative values that means the additive was not effective for some of the cars. 
 D) Yes, since Q1 is 1 that means only 25% of the data had less than a 1 mile increase in distance traveled.