A standard roulette wheel contains the numbers 1-36, and two spaces marked "O" and "00." Half of the numbers are labeled black, and half of the numbers are labeled red. The numbers "O" and
00" are labeled green. Half of the red and black slots have even numbers, the other half odd
numbers. When the wheel is spun, a ball rolls along the outer edge of the wheel until it falls into
one of the numbered slots. What is the probability that the ball lands on a black number or "O"?
A) 1/2
B) 19/36
C) 2/18
D) 19/40