Angles α=(2x+5)∘ and β=(3x−15)∘ depend on an integer x. Which one of the following statements is true?
a) The angles are complementary when x=38.
b) No integer value of x makes the angles complementary, but x=38 makes them supplementary.
c) The angles are complementary when x=20.
d) The angles are supplementary when x=34.