Although the charter of Westside School states that the student body must include some students with special educational needs, no students with learning disabilities have yet enrolled in the school. Ttherefore, the school is currently in violation of its charter. The conclusion of the argument follows logically if which one of the following is assumed? ['All students with learning disabilities have special educational needs.', 'The school should enroll students with special educational needs.', 'The only students with special educational needs are students with learning disabilities.', 'The school currently has no student with learning disabilities.']