Respuesta :
b. is the answer because he can just refill the 1 gallon jug to eventually measure out 3 gallons!
The Correct answer would be B. Because it wouldn't be logical to fill the Water with a teaspoon or a 100 gallon barrel. It would be unnecessary to fill a 100 gallon barrel up just 3 gallons It doesn't make sense. So a One Gallon jug that you fill and dump 3 times is much more sensible.