D. 1/16
Because Kelsey used already half an acre of land and then DIVIDED it into 8 equal parts then you would use division. You would be dividing 1/2 by 8. One way to do this would find the reciprocal of 8 (which is 1/8) and multiply it by 1/2. You would do 1/2*1/8 which would give you 1/16.