Concept:To make a number divisible by 19, add the difference between the next multiple of 19 and the given number.Explanation:Divide 308 by 19.19×16=304Remainder =308−304=4The next multiple of 19 is 19×17=323.So the least number to be added is 323−308=15.Thus, 308+15=323, which is divisible by 19.Answer:15 (Option C).