Which event is most likely to occur?

A. Flipping a fair coin, with sides labeled heads and tails, and the coins landing on tails.
B. Choosing a marble out of a bag, with face labeled one to six, and the cube landing on a number less than six .
C. Rolling a fair number cube, with faces labeled one to six, and the cube landing on a number less than six.
D. Spinning the arrow on a spinner, with four equal sector labels one to four, and the arrow landing on a number greater than one