Let the number of female non smokers be X, and
Let the number of male non smokers be Y, then
number of female smokers = 0.5 X and
number of male smokers = 10

Now the question can be rephrased to Is Y > 0.5X

1) 12 males don't smoke in the group

Y = 12, Insufficient data. Hence Insufficient!

2) 60% of nonsmokers are females

Total number of female smokers/Total number of smokers = X/(X+Y) = 60/100
X/Y = 3/2
Y = 0.66X > 0.5X, Sufficient to answer the question

IMO B