Answer: The answer is (B) one year.
Step-by-step explanation: Given that the earth has revolved exactly once around the Sun since the last time that Samson went to the zoo. We are to find the duration of time that has passed.
We know that the earth revolves round the sun in exactly 365 days, which makes a complete year. So, the time duration will be one year.
Therefore, its been a year since Samson went to zoo.
Thus, (B) is the correct option.