we walked in in search of some direction to find a line of at least ten , all with poison in hand waiting to make their purchase . assuming we 'd have better luck outside we returned to the parking lot and katie suggested we find the visitor info center we read about.a voice from behind perked up ... " i ' m from the visitor info center . what do you need ?
According to the above context, answer the following question.
Why did we hear a voice from behind us ?


Because Katie mentioned the visitor info center .