Which event is most likely to happen?
A).  randomly picking a consonant from the English alphabet
B). randomly picking a vowel letter from the English alphabet
C). getting a 6 when rolling a single dice once
D). getting a head from a single toss of a fair coin
D). getting a head from a single toss of a fair coin
This event has a 50% chance of occurring, which is the highest probability compared to the other events listed.