12. Mr. Hendrick told them not to mix the chemicals, but Sam
and Mark never listened to Mr. Hendrick. After all, he was
always telling them not to do this or not to do that. Now that
the classroom had been destroyed, both of the boys wished
that this time they had listened to Mr. Hendrick.
What was the effect of the boys not listening to Mr. Hendrick
about the chemicals?
A. The boys decided to listen in the future
B. The boys got a bad grade in chemistry, causing them to
fail.
C. Mr. Hendrick taught the boys lab safety
D. The boys mixed the chemicals, causing an explosion​