Teresa takes five hours to brew a gallon of root beer and three hours to make a pizza. Beth takes eight hours to brew a gallon of root beer and four hours to make a pizza. Teresa's opportunity cost of making a pizza is ________.
1) 2/5 of a gallon of root beer
2) 3/5 of a gallon of root beer
3) 4/5 of a gallon of root beer
4) 5/5 of a gallon of root beer
