Step 1: Interpreting the Slogan
The slogan "Vadakku Vaazhkiradhu; Therkku Thaekiradhu" means "The north thrives even as the south decays." This phrase articulated the perceived political and economic inequality between India's northern and southern regions. It advocated for increased political and economic autonomy for southern states, especially Tamil Nadu.
Step 2: The Dravidian Movement's Role
The Dravidian movement, spearheaded by the Dravida Kazhagam (DK) and subsequently the DMK (Dravida Munnetra Kazhagam), aimed to counteract the dominance of northern, Hindi-speaking states over the south and to advance the well-being of the Tamil-speaking population. This slogan became a crucial element of the movement, voicing opposition to North Indian hegemony and highlighting the necessity of social, economic, and political empowerment for the Dravidian populace.
Step 3: Conclusion
The slogan was extensively employed during the Dravidian movement, confirming Option 4 as the correct choice.