Assertion: Regional aspirations are usually expressed in the language of the region and addressed to the local population or the rulers.
Reason: Sometimes, regional aspirations were so strong in some areas that it was expressed outside the framework of the Indian Union.

Both the Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

Regional aspirations are usually expressed in the language of the region and addressed to the local population or the rulers and there is compatibility of the regional aspirations with nationalist sentiments.
As democratic experiment unfolded, people from different regions began to express their aspirations for autonomy. Sometimes these aspirations were expressed outside the framework of the Indian union. These involved long struggles and often aggressive and armed assertions by the people.