Light A is only on if light B is also on. Light C is always off when Light B is on. Light D is always off when light A is on. Light D is currently on. What can be currently said about the state of lights?

Only that light D is currently on.

Lights A and B are off

Light C is on and Lights A and B are off

Light C is off

Answer:
Only that light D is currently on.

Note: This Question is unanswered, help us to find answer for this one