For this question you will need to make sure you weight or mass in the correct unit. To do this in one shot we can start off with what they give us of 0.25lb along with the 13.6g/mL for our final conversion factor.
0.25lb x (453.592g /1lb) x (1 mL/ 13.6 g) =
notice how all of the unit will cancel out giving you the the unit you desire and thus the answer. So now if you plug in the operation above into your calculator you should get the answer