Taylor needs to roll a 4, 5, or 6 to win. (3rd option).
A dice has six numbers that might come up in any roll. Taylor needs one of the three named above in order to win.
She has three chances to win the game with the sides 4, 5, or 6. This is half the amount of all the six sides of a dice that she rolls (1, 2, 3, 4, 5, 6).