La muralista <span>habrían</span> mejorado el aspecto de esta pared si hubiera pintado niños jugando.
'The muralist would've improved the aspect of this wall if she/he would have painted children playing.' - translation in my own words.
I hope this helped - Maria S.
Answer:
ellas responden would be the correct conjugation.
As it is el autobus, you fon't say el bus? Or as metro doesn't have to stop as much.
