<h2>A: A</h2><h3 />
Por cierto means "by the way".
But with the options we have here, I would say <em>by certain</em>.
NO TRANSLATOR | FLUENT SPEAKER | BILINGUAL
Good Luck!
A. Un cuento
because cuento means story
Not puerta because that is door
nor is it casa because that is house
and it is not calle because that is like streets or neighborhood