The option "none of these" improves multiple-choice test items.
Kolstad
R K
RK
Department of Elementary Education, East Texas State University, Dallas.
Kolstad
R A
RA
D004497:Education, Dental / Q000379:methods*; D004521:Educational Measurement / Q000379:methods*; D006801:Humans; D015203:Reproducibility of Results; D013781:Texas