Stem: "k" will always be a non-negative number (or zero if k=0). To get the answer we need the values for "m".

i) "k" lies between -2 and 4. We do not know the values of "m". Insufficient.

ii) "m" is positve. We have two cases

Case a) When "k"= any number (any non zero number including decimals) and "m" is postive, then k^2/m>0

Eg: k=3 and m=3 --> 9/3=3 --> 3 > 0

Eg: k=-3 and m=3 --> 9/3=3 --> 3 > 0

Case b) When k=0 and m=3

k^2/m=0. We are asked to find k^2/m<0. Therefore 0<0 is not possible. Case b is invalid.

Therefore using case a, B is sufficient to answer.

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