28. Which of the following statements about positive integers is NOT true?
(A) If x is a composite integer, then x has a prime divisor less than or equal to the square root of x.
(B) There are infinitely many prime integers.
(C) Integers a and b are congruent modulo m if and only if there is an integer k such that a b km.
(D) If a divides bc, then either a divides b or a divides c.
(E) If a divides b and b divides c, then a divides c.
