Read the following passage
"you're not here to read books, you're here to learnt" the
childwrangler's voice screeched as we kept our picks
moving rhythmically against the school walls. we had all
heard about a time, back in the dark ages, when children
read books at school. they say school was even a building
above ground. but that was obviously dangerous. how
could society thrive if the children sat around reading all
day? when would they have time to learn about veins of
coal, support structures, processing fuel, and all that stuff?
school was important.
what is one way the author uses irony to convey his message?

a. by placing a childwrangler in charge, he shows how authority over
children can be abused,
b. by describing school as important, he shows that the love of
leaming cannot be eliminated,

c. by describing a coal mine as a school, he shows how a positive
institution can be corrupted,

d. by referring to the past as the dark ages, he shows that our
civilization has made a lot of progress