Because there are so many students in that class, I can sometimes sleep in the back row.
Who is a students?
A student is a person who is enrolled in a school or other educational institution and is referred to as a student. The word "student" in the UK and the majority of Commonwealth nations refers to those enrolled in secondary schools and above; "pupils" refers to those enrolled in primary and elementary schools.
What is a class?
A class is an extensible programming-code template for building objects that offer default settings for state and behavior implementations.
What is sleep?
A naturally occurring physical and mental condition called sleep is characterized by altered awareness, significantly suppressed sensory activity, decreased muscular activity—nearly all voluntary muscles are inhibited during rapid eye movement sleep—and decreased interactions with the environment.
Because "are" is used when there are plural indefinite pronouns. And the given sentence talks about multiple students.
Hence the correct option is, A. are
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