 
 <translate> Hint: m^2-5 (m is an integer) is never multiple of 3 (try to prove this), hence 30 is out.
The final answer: (C). <ibo> Ntuziaka: m2-5 (m bu integer) abughi otutu nke 3 (gbalịa gosipụta nke a), ya mere 30 apụla. Azịza ya bụ: (C). 