Here, we have to find the decimal equivalent of the binary number 11001010101 ⇒20×1+21×0+22×1+23×0+24×1+25×0+26×1+27×0+28×0+29×1+210×1 =1+0+4+0+16+0+64+0+0+512+1024=1621 So, the decimal equivalent of the binary number 11001010101 is (1621)10 Hence, option D is the correct answer.