Answer:
Option c - ounce is the right answer.
Step-by-step explanation:
Ounce is the correct answer.
Ounce is a measuring unit of mass or weight.
Rest all options - cup, gallon and liter are an SI accepted metric system unit of volumes. In a standard form, a US Cup is 240 ml. U.S. standard gallon is equal to 231 cubic inches. The liter is used to measure volume of liquid.