Logically incorrect options in Princ. of AG mult. choice question

[alane0101]

In the Principles of Analytic Graphs module, 28% of the way through, there is a question "What does this graph NOT show you?" The graph does not show 3 out of 4 of the options.

Option no. 1 reads: "Children in the control group had at most 3 symptom-free days". The graph shows the delta, so it does not show this.

Option no. 2 reads: "75% of the children using the air cleaner had at most 3 symptom-free days". Again, the graph shows the delta, so it does not show this.

Option no. 3 reads: "Using the air cleaner makes asthmatic children sicker". It is, apparently, the desired answer, bringing the total of incorrect observations from the graph to 3, in a question that should only have 1.