Choose the correct option from the following to fill in the blank regarding the regions of nationalist leaders of India :
Bipin Chandra Pal : Bengal; Lala Lajpat Rai : ____________
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The assertive nationalist trio "Lal-Bal-Pal" represents a cross-regional alliance: Lal (Lala Lajpat Rai $\rightarrow$ Punjab), Bal (Bal Gangadhar Tilak $\rightarrow$ Maharashtra), and Pal (Bipin Chandra Pal $\rightarrow$ Bengal).