1/4 is not likely because likely is a lot of chance but 1/4 is 25% which is not a lot.
1/4 is not certain because certain is it's sure that it will happen which is 100% but 1/4 is not 100%, it's 25%
1/4 is unlikely because unlikely is some chance and 1/4 is 25% which isn't much but still have a chance of happening.
C.) unlikely is the answer