Read the scenario.

The police are going door-to-door in a neighborhood to interview residents about a series of crimes in the area. As they approach one door, they hear loud noises from inside the house, including someone shouting for help. The police do not have a warrant, but they quickly enter the house to see whether someone is in danger.

Under what grounds might this search be lawful?
Miranda rights
double jeopardy
probable cause
search and seizure