100 percent. an event that cannot possibly happen has a probability of zero. so if it definitely cannot happen, its probability of occurring is nothing; it’s zero, which could be written as zero or zero percent. now, if there is a chance of an event happening, then its probability must be between zero and one, which is the same thing as between zero percent and 100 percent.
so let’s go through our options and make sure these are between zero and one. only one of them should be. so a) is 41 percent. 41 percent is indeed between zero percent and 100 percent. so it’s a possibility. b) has value 1.6. 