Identify the INCORRECTLY spelt word in the given sentence.
The graduate students have discovered that they can address issues more effectually through letter writing campaignes and not through public demonstrations.

Correct option is C

Option (c) is incorrectly spelt word.
Correct spelling is: "campaigns" – Campaign means a series of planned activities aimed at achieving a particular result. (अभियान)
Example: The government launched a campaign against smoking.
Meanings of all the given options:
· Address: to deal with or discuss (समाधान करना)
· Discovered: found or became aware of something previously unknown (खोज निकाला)
· Campaignes: (Incorrect spelling) intended meaning is Campaigns (अभियान)
· Demonstrations: public displays of group opinion or protest (प्रदर्शन)
�� Part of Speech: Campaign is a noun.