In the suit, students blamed "substandard performance on poor conditions within their classrooms ..." These conditions included "missing or unqualified teachers, physically dangerous facilities, and inadequate books and materials." Those shortcomings had deprived them "of a basic minimum education" including learning to read. The ruling is likely to spark similar lawsuits around the country. Which word or phrase from the selection shows a critical tone?

A
substandard
B
performance
C
conditions
D
facilities