Which of the following number are rational

Question

(A) 19 (b) 16 (c) 17 (d) 18

Answer 1

clearly all of them,
check for the definition of a rational number in your text or
your class notes.

Answer 2

maybe you meant √19 √16 √17 √18
if so, only √16 is rational (√16=4)

Answer 3

Bad