34 is 40% of what number (a)6
(b)85
(c)60
(d)0.85

so, 6 is way to low to be a possibility.

and 30 is half of 60 so 34 wouldn't  be 40 percent of 60.

and, it wouldn't be 0.85 that is less than 6 so they are both way too low 

from my understanding the answer would be 85  hope i helped. :)