when physical energy has resulted in a response in a sense organ, it is clear that:

Answer 1

...the person is alive?

If you had choices here, it might be helpful.

Answer 2

the stimulus has been sensed?

Answer 3

when physical has resulted in a response in a sense organ, it is clear that:
A) perception has taken place.
B) the activation is the result of stimulus.
C) the brain has interpreted the event.
D) a single isolated sense is now perceiving the event.