A recent report from the Bureau of Justice states

[asker]

"A recent report from the Bureau of Justice states although only a fraction of a percent of the American population is in prison, approximately one out of every thirty two Americans are either in prison or on parole or probation.
A. although only a fraction of a percent of the American population is in prison, approximately one out of every thirty two Americans are either in prison or on parole or probation.
B. that while less than a percent of the American population is in prison, one out of every thirty two Americans are either in prison, on parole, or on probation.
C. that although less than one out of every one hundred American people are in prison, more than three percent of Americans are either in prison, on parole, or on probation.
D. that while only a fraction of a percent of the American population is in prison, one out of every thirty two Americans is either in prison, on parole, or on probation.
E. while only a fraction of a percent of the American population is in prison, one out of every thirty two Americans is either in prison, on parole, or probation."


Official Exp:
(C) The sentence incorrectly matches the subject-verb pairing in the phrase “one out of every one hundred American people are”. The subject of this sentence is the singular noun “one”, whereas the verb is the plural noun “are”.


I chose C
"one out of every one hundred American people are in prison" represent a bunch of people, why cannot use "are", don't understand here why "one" is the subject