Why did national feeling become stronger after the Jallianwala Bagh incident?

Correct answer: Because people deeply felt colonial injustice and repression

The governing concept is the growth of national consciousness through shared experience of colonial violence. The massacre of unarmed people at Jallianwala Bagh revealed the brutal limits of colonial rule and destroyed faith in its claims of justice. Anger and grief therefore strengthened opposition and national feeling. A is correct; B did not happen, C is the opposite consequence, and D contradicts public reaction to the Rowlatt regime.