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Maximum 25 digit decimal number = $10^{25} – 1$

Maximum x bit binary number = $2^x – 1$

$10^{25} – 1 = 2^x – 1$

taking log

$log 10^{25} = x$

$x = 25 log 10$

$x = 25 * 3.3$

$x = 82.5 $(approximately 83)

So none of these are correct.

Ref: https://www.geeksforgeeks.org/isro-isro-cs-2015-question-77/