Which of the following reasons explains why the sum of 13+16√3 is a rational number? a. since 13 and 16√3 both have terminating decimals when written in decimal form, their sum is a rational number. b. a rational number is any number that can be graphed on a number line. since 13 and 16√3 can both be graphed on a number line, their sum is a rational number. c. rational numbers are whole numbers along with their opposites. since 13 is the opposite of the whole number 3 , and 16√3 is the opposite of 316√ , their sum is a rational number. d. both 13 and 16√3 and are rational numbers. therefore, their sum is a rational number.