The Poona Pact, signed between Dr. B. R. Ambedkar and Mahatma Gandhi in 1932, did provide for reserved seats for scheduled castes in the legislative councils. However, the pact called for a separate electorate for the scheduled castes, not a joint electorate as mentioned in Statement I. Therefore, Statement I is false.

Statement II states that Dr. B. R. Ambedkar withdrew from active politics for almost a decade when the Communal Award was revoked. This statement is true, as Ambedkar did indeed retire from politics for a period of time after the Communal Award was withdrawn in 1933.

So, both statements are individually true. However, Statement II is not the correct explanation of Statement I, as there is no connection between the Poona Pact and Dr. B. R. Ambedkar`s withdrawal from active politics.

Therefore, option 2 - "Both the statements are individually true but Statement II is not the correct explanation of Statement I" is the correct answer.