Probability QBank Question particular, increase, between

Andreas42

The number of days a particular stock increases in a given fiveday period is uniformly distributed between zero and five inclusive. In a given fiveday trading week, what is the probability that the stock will increase exactly three days?
A) 0.333.
B) 0.600.
C) 0.167.
Answer given in schewser answers is C. Can someone explain how it comes down to C?