One thing that the Qing dynasty did differenly compared to other dynasties before it is they opened up China's relation with other foreign countries. (Previous dynasties completely shut off China from foreign influence).
Opening up this foreign relationships made it possible for China to acquire new knowledge/information regarding new development in technology. This action accelerated the modernization in China.
C is your answer because a in 24 hours doesn't mean that thats how it is all the time thats just a 1 time reference in 5 days is really just w hat happens in a week which the weather man can tell you but 5 years thats evidence that can be proven not every day but on most days of the year
