Read the following premise and answer if the hypothesis is true.
Preliminary tests identified the source of the outbreak as the highly contagious norovirus, which had struck several guests just before they boarded the cruise Nov. 3 in Rome, Carnival officials said.
Hypothesis: The outbreak could have been avoided if people washed their hands more.. Is the answer "Yes", "No", or "It's impossible to say"? Respond with only the answer and no additional text.
It's impossible to say
It's possible, but not definitive. The norovirus is highly contagious and can spread easily even with frequent hand washing. However