$99 \% = 0.99$. Since $0 \leq 0.99 \leq 1$, this value could be the probability of an event.
b. $0.9$. Since $0 \leq 0.9 \leq 1$, this value could be the probability of an event.
c. $9.9$. Since $9.9 > 1$, this value cannot be the probability of an event.
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