• # question_answerA) 960                     B)        628C) 830    D)        492E) None of these

Explanation Option [c] is correct. The number in the centre is the product of all the 4 numbers minus 10, i.e., $(3\times ~5\times ~2\times ~6)-10=170;(8~\times 1~\times \,4~\times \,9)-10=278$ Similarly, $(10~\times \,6~\times \,\,7~\times \,2)-10=830$