What does Not the author tell us in part one in order to introduce his opinion?

A、
A teenage salesgirl was unable to do simple mental calculations.

B、
A class of 60 seniors at a private college were impossible to write

a short paper without misspellings.

C、
Many students I see know nothing about world history or geography.

D、
A friend.s lazy 26-year-old daughter who preferred to go to school.