The government will purchase and install new severe weather sirens for this area next year if replacement parts for the old sirens are difficult to obtain. The newspaper claims that public safety in the event of severe weather would be enhanced if new sirens were to be installed. The local company from which replacement parts were purchased last year has since gone out of business. So, if the newspaper is correct, the public will be safer during severe weather in the future. The argument's conclusion follows logically from its premises if which one of the following is assumed? ['Replacement parts for the old sirens will be difficult to obtain if the government cannot obtain them from the company it purchased them from last year.', 'The newspaper was correct in claiming that public safety in the event of severe weather would be enhanced if new sirens were purchased.', 'Because the local company from which replacement parts had been purchased went out of business, the only available parts are of such inferior quality that use of them would make the sirens less reliable.', 'The local company from which replacement parts for the old sirens were purchased last year was the only company in the area that sold them.']