"Numerous Indian citizens are hurt when an office building is attacked by the British" would most likely cause an increase in Indian nationalism.
This is further explained below.
Generally, It is a political philosophy that stresses the importance of loyalty, devotion, or allegiance to a country or nation-state and maintains that such duties are more important than other individual or group interests.
In conclusion, Increased Indian nationalism would be probable if the British assaulted an office building and injured many Indian nationals.
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