Five events occurred in a sequence: E1, E2, E3, E4, and E5. E1 happened before E3 but after E2. E4 occurred after E3. When did E5 happen?

Answer: C. After E2 and E3
E1 is after E2 and before E3, and E4 is after E3, so E5 must occur after both E2 and E3.