When subjected to high temperatures, the building construction materials emit unique sounds. The sound sensor alarms will detect these sounds and provide an early warning of a house fire, allowing occupants to escape before being smoked by smoke. Because smoke is a house fire The most common cause of casualties is the installation of an alarm will effectively reduce the casualties of a house fire. Which of the following hypotheses, if correct, can best refute the above discussion? ? ['If the sound sensor alarm is widely used, its high cost will be reduced.', 'When completely burned, the sound of many building materials can be heard from hundreds of meters away.', 'Many fires start on sofa cushions or mattresses indoors, generating a lot of smoke without making a sound.', 'In some larger houses, multiple audible alarms are required to achieve adequate protection.']